A few notes for the novice baby-entertainer: Repetition is important. Many games won't work the first time you play them. Your baby's attention span will vary a lot, depending on his age, his temperament, and his mood. Sometimes he'll enjoy a game for as long as 20 minutes, but more often you'll need to modify the game every five minutes or so. You'll know your baby's loving your antics when he's turning toward you, smiling, or laughing. But if he squirms away from you, looks away, or cries, it's time to change the activity.

Not every baby will catch on to every game. Don't allow this to freak you out, but of course if you have concerns about a possible developmental delay, talk to your baby's doctor.

Birth to 3 months

To the outside observer, a newborn basically seems like a pooping ball of protoplasm. Your baby will mostly just lie there, except when he's crying. So how can you connect with him and have fun?

Your best chance of doing this is to engage your baby's senses: touch, sight (remember, your baby is still very nearsighted), smell, and hearing. (Let's leave taste out for now.) By the end of his first three months, your baby may reach out and try to grab things and will be fascinated by sounds, smells, and patterns.

Note: It may take your newborn several seconds to respond to you or he may not respond much at all. Be patient – you may need to keep trying or wait a while for him to enter an alert, responsive state.

Dance, Dance Revolution

In the afternoons when my own baby got grumpy, nothing worked as well as dancing with her. I'd put on some music – she preferred soulful tunes from Stevie Wonder and James Brown – and either put her in the sling or hold her in my arms.

At first she preferred soft swaying. Later on she liked me to swing her in the air or bump her up and down rather rudely. (Just be sure to offer neck support and don't shake your baby.) When your arms get tired, put your baby down and keep up the dance.

Silly exaggerated movements like jazz hands or shaking your butt are particularly funny to babies. Close the drapes so the neighbors won't see.

Let's Look at Stuff

Most of your early playtime will be spent showing your baby stuff. Any object in the house that won't poison, electrocute, or otherwise hurt him is fair game. Babies love egg beaters, spoons, wire whisks, spatulas, books and magazines with pictures, bottles of shampoo or conditioner (don't leave your baby alone with these!), record albums, colorful fabrics or clothes, fruits and vegetables, and so on.

Keep a little stash of objects beside you and sit with your baby. When the moment's right, whip something out like a magician. "Look, Kyle, Daddy's bicycle bell." Hold the object still about a foot from his face and stare at it yourself. Hey, now that you look at it, that bicycle bell is kind of interesting. Congratulations! You're thinking like a baby!

Oh, and don't expect babies to really "get" books at this age. You'll know they're enjoying them by their way of getting still and watchful when you bring a favorite book out.

Babies don't tend to sit through a whole story, though, and when they're a few months older they'll grab the books from you and close them. This is all developmental stuff. Babies love looking at books and cuddling close to you, but they usually don't care about the plot.

Journey Into Mom's Closet

You haven't spent a lifetime accumulating a closetful of bright, slinky, tactile clothing for nothing. Dig into your closet and show your baby your cashmere sweater, your cottony-soft favorite jeans, your brilliant plaid skirt. Run soft or silky fabrics over her face, hands, and feet. Lay fuzzy stuff down on the floor and put your baby on top of it.

In a few months, your baby will want to run her hands over anything beaded, embroidered, or otherwise embellished. But for now, she may just be content to gaze in wonder.

Hey! What's Over My Head?

You'll be amazed at how much fun you can have with the simplest stuff around your house. Here are three ideas to start you off:

Tie or tape some ribbons, fabric, or other interesting streamers onto a wooden spoon and dangle them gently over and in front of your baby's face.

Take a floaty scarf and fling it into the air, letting it settle on your baby's head.

Tie a toy to an elastic string (like the kind used for cat toys) and bounce it up and down in front of your baby's face, saying "Boing! Boing!" every time it descends.

Remember, never leave your baby alone with strings or ribbons that could encircle his neck or that he could get into his mouth.

The Diva Within

You may have a terrible voice – but your kid doesn't know it! Now's the time to sing at volume 10, so set free that opera voice inside you.

Your baby may like absolutely anything you sing, but there are some classics you should know. "Itsy Bitsy Spider" was the only song that made my baby stop crying when she was on a jag. And most kids like any song with movements – "The Wheels on the Bus," "Row, Row, Row Your Boat," "Head, Shoulders, Knees, and Toes," and "Patty-Cake," to name a few. (If you don't remember the words to a favorite song, just look online.)

You may feel silly at first, but as your child gets into it, so will you. Try adding your baby's name to the song: "Old Mac Ethan had a farm," "Kate is my sunshine, my only sunshine," and so on. Try songs with silly sounds or animal noises in them, like "Witch Doctor" or "How Much Is That Doggie in the Window?"

Try singing a song in a low growly voice and then in a high squeaky voice, to see which gets the most reaction. Try singing the song breathily into your baby's ear, or use a hand puppet (or a napkin or sock willing to play the part of a hand puppet). And get used to singing, because this could begin to eat up a significant portion of your day.

4 to 6 months

At this age, your baby will become a lot more physical, learning how to roll over and even sit up. She can now hold, handle, and mouth objects, and she'll spend a good part of her busy days doing so (meaning extra vigilance is needed on your part).

Games can get more physical now. Your baby might enjoy knee rides or tickle games. She's also more responsive to you, making noises and meeting your eyes.

Smell the Spice Rack

You're in the kitchen, trying to throw some kind of dinner together when your baby starts wailing. Take him over to the spice rack and introduce him to the intoxicating scent of cinnamon. Rub some on your hand and put it up to your baby's nose. (Don't let it get in his eyes or mouth.)

If he likes it, try others: Vanilla, peppermint, cumin, cloves, nutmeg, and many other herbs and spices have intriguing fragrances that your baby might love. Other household goods are fragrant, too: Dad's shaving lotion, Mom's hand cream. Sniff out everything yummy – just be careful not to let your baby eat it!

Bubbles, Bubbles Everywhere

There's something magical about bubbles, and at this point your baby can see far enough away to focus on them. Blow bubbles when she's getting fussy waiting for the bus and watch the tears dry up. Blow bubbles in the park to attract older kids who'll caper nearby and entertain your baby in the process. Blow bubbles in the bathtub or out on the porch when it's late afternoon and your baby is cranky. Bubbles are unbelievably cheap, easily transportable, and endlessly fascinating for babies.

I'm Gonna Get You!

Your baby is old enough to have a sense of anticipation now. And no baby can resist your coming at him mock-menacingly with a threat of hugs, kisses, or tickles. Here's what you could say: "Hey, Sweetpea! I see you over there sitting up! Well, that just makes you closer to my lips and I'm going to come over there and kiss you! I'm going to steal a kiss, baby! I'm coming! I'm coming! I... gotcha!" Then cover your baby in smooches.

In our house we threaten to eat the baby and punctuate our advances with lip chomps on her fat little feet. A delicacy! When your baby's older you can modify this game to include a chase around the house – this works wonderfully as a way to get your child out the door when you're in a rush.

This Little Piggy

Touch your baby's toes in turn, starting with the big toe. Say, "This little piggy went to market, this little piggy stayed home, this little piggy had roast beef, this little piggy had none. And this little piggy went wee-wee-wee all the way home."

As you say that last part, run your fingers up your baby's belly. This game is useful for putting on socks and shoes or distracting your baby during diaper changes. You can also play this game in the bathtub with a squirt bottle targeting your baby's toes.

Tummy Time

It's important to have your baby spend time on her tummy, even if she protests vociferously.

Get down on the floor with your baby. Look her in the eye as you lie on your own belly. Lay your baby down on a towel and use it to gently roll her from side to side. Try saying, "Oops-a-daisy, Oops-a-daisy" as you roll her.

Fly, Baby, Fly!

Now that your baby can hold his head up, it's time to hoist him into the air. You can play that he's a rocket ship, flying him over you and making realistic rocket noises. You can play that your baby is in an elevator, which advances up floor by floor before sinking quickly to the bottom (my husband likes to bump noses with our baby and say "Ding!" at this point). Or pretend that your baby's doing a helicopter traffic report.

7 to 9 months

Your baby's becoming an expert at sitting and may soon be crawling as well. Encourage these physical feats by celebrating each new milestone with claps and a cheer: "Yay, you sat up! Amazing baby!"

The ability to transfer objects from hand to hand and the fabled pincer grasp are part of your baby's increasing hand control (which means you'll be forced to carry a container of O-shaped cereal with you at all times for the next year).

Your baby also begins to understand that when an object moves out of sight, it hasn't disappeared from the face of the earth. This discovery makes games like peek-a-boo a favorite.

Touch It, Hold It, Bang It

If your baby has one object, she'll bang it on the table. If she has two objects, she'll bang them together, hold them up to the light, squint at them, bang them separately on the table, hit the table with both at the same time, see if the object sounds different when hit using the left hand rather than the right hand, and on and on.

Help her out by handing over objects that make interesting sounds: hollow containers, metal spoons, bells.

Pay attention to tactile sensations as well: Your baby will be fascinated by an embossed greeting card or the slickness of Mom's enameled jewelry box. A baby with strands of cooked spaghetti to play with will be thoroughly entranced.

I Can Control the World

Babies love cause and effect at this age, as in: I do this, the light comes on. I do that, the light goes off. Showing your baby how to work light switches, faucets, doorbells, and more will thrill him – but can make life more difficult for you when he insists on being held up to work the lights yet again.

Instead, you may want to offer a other dangers (dressers with drawers pulled out can turn over on a child) and then let your baby go to town.

Obstacle Course

If your baby's crawling, scooting, or walking, she may enjoy the challenge of having to move over things. (This is great for developing her motor skills, too.) Pillows, tired parents, and laundry make good obstacles. Sleeping cats do not.

So Many Variations on Peek-a-boo

The classic: Hold up a towel between your face and your baby's and ask, "Where's Sam? There's Sam!" over and over again. You can vary this game in a million ways. Hide behind a door and make your baby push it open to see you. Hide behind a chair and pop out first from above then from the sides. Go behind a corner with another person and alternate who jumps out and yells "Boo!"

Keep a selection of hats behind the couch and pop up wearing a different one each time. A surefire laugh-getter is to put a hat on your head, low enough to cover your eyes, and let your baby take it off, saying "Oh!" in surprise each time he does it. (This will also guarantee that you'll never wear a hat in peace again.)

Roll Play

Babies are fascinated by balls and how they move. You'll get a big laugh by juggling or tossing balls up in the air and letting them hit the floor while you make a silly sound effect: "Whoops!" Roll a soft ball toward your baby and watch her grab and squeeze it. Eventually, with encouragement, she'll roll the ball back toward you. And someday she'll be able to kick and toss the ball or drop it into a big bowl or bucket. For now, bounce and roll.

10 to 12 months

Developmentally, your baby has suddenly morphed into an almost-toddler. Games that allow him to practice so-called gross motor skills such as standing, pulling up, and climbing are important for him now. Your baby will also like to work on his fine motor skills by fiddling with the tag on your shirt or the pages of a book – and maybe your breasts or bra if he's still nursing.

Rearrange and Re-rearrange

Your baby is figuring out the connections between objects in the world. She'll love to stack and arrange objects, as well as fill and empty them.

Give your baby a box that's easy to open (like a shoe box) and show her how to put things inside and take them out. At our house, this game quickly evolves into "Take everything out of Mommy's purse and fling it wildly around the living room," which is why I no longer carry change or pens.

Another way to play this game: Get a bunch of cups (maybe even stackable measuring cups – ooh, two toys in one!) and show your baby how to pour water, sand, or cornmeal from one to the other, or into a larger container.

The Endless Cruise

Once your baby is up on his feet, you can encourage cruising by placing a favorite toy at the far end of the couch or over on the coffee table. Try enticing your baby by putting one of your toys, such as your or sunglasses, a distance away and cruising on your knees toward it. Your baby may find this amusing and attempt to join you.

Encourage your baby to push an object around the room. Push toys and large empty boxes work well. Avoid folding chairs, which can fold up unexpectedly.

Top That Kid

Babies this age love to imitate. Encourage this behavior by making a ridiculous noise and then nodding at your baby to go ahead and try a noise. She may imitate you or make her own noise, which you can imitate. Or you can make up a new noise of your own.

You can also play this game with faces or movements – our kid likes to raise her arms in a V shape and wave them around. When we do it back, her expression is of someone witnessing magic.

The Bath Is Fun

No longer is your baby content to sit in the tub and be washed. Older babies want to stand up, splash, grab your hair, pat the shower curtain, and so on. (Note: Never leave a baby unattended in the bath, not even for a minute.)

Encourage the fun by adding lots of toys to the tub. Plenty of stuff around the house can be endlessly filled, drained, poured from or into, and floated. Pile up some plastic cups, yogurt containers, funnels, and squeeze bottles, and bring them into the bath along with any of your baby's plastic toys.

Poke holes in the top of a plastic bottle with a flat cap to make a homemade watering can. Let your baby feel the sensation of the water dripping onto him and show him how to cut off the flow by blocking it with his hand. Use your homemade toy to give his rubber ducky a shower.

At the end of the bath, drain the toys in a plastic colander or a net bag suction-cupped to the side of the tub. Hopefully your baby is clean, happy, and ready to sleep. Wasn't that fun?