"At four months, we took the advice of health professionals and started offering top-up bottles after a medical report noted 'failure to thrive'. It was heartbreaking. Unfortunately, of course, my supply dropped, and my boy was getting more and more frustrated at the breast, only calming when his bottle arrived. There were tears at every feed. At five months we weaned, as it seemed unfair to see our baby getting upset and frustrated.

"Now, six weeks on, I'm still mourning the loss of our breastfeeding relationship. When he has an unsettled day I have feelings of inadequacy, not being able to comfort him at the breast. I also feel haunted by hindsight. Could I have done more?"

It's perfectly normal to have feelings of grief and self-doubt when weaning from breastfeeding happens earlier than you'd planned. But there can be other, strong emotions that can be related to weaning, whatever the age of your child, or whether this was a 'natural' weaning decided by your baby or a gradual 'mother-led' weaning.

While there's a plethora of research and awareness programs about postnatal depression, there's a lack of information about post-weaning depression. There's a paucity of awareness, even among health professionals. One mum who suggested her diagnosis of clinical depression seemed to be associated with weaning was told by her psychiatrist, "Well, if that's what you want to believe."

Is it any wonder, then, that women who experience symptoms of depression, including extreme sadness, low energy and vicious mood swings around weaning are anxious about speaking out and reluctant to seek help?

In fact, most discussion of post weaning depression comes from the blogosphere.

Susan Schade, a writer and 39-year-old mother of three, weaned gradually around her son's first birthday. She says, "I took plenty of time and started by just dropping one feed a day. About three or four days later, I dropped another one. The transition was very smooth. It was easier to stop breastfeeding my son than I thought it would be. I wasn't expecting it would be worse for me than it was for him.

In her blog, she describes how her emotions began to change as she started dropping feeds. It plummeted to feeling "like the worst PMS" she had ever experienced: "I snap at my husband when he tries to use a certain coffee cup. I grit my teeth at my kids when I hear them fighting with each other. I look at my baby drinking whole milk out of a sippy cup and I burst into tears. It is 6.40am on a Monday and it has been two days since I quit breastfeeding."

Another blogger, Swistle, went through something similar while weaning. "I don't know what's the matter with me; it's like I've lost my mind. I'm on the edge of fury all the time; I spent all yesterday and all morning so far today losing it over every little thing. EVERYTHING drives me crazy in about two seconds. It seems way out of hand."

Breastfeeding is a finely tuned chemical connection between mother and child. Although there's a veritable cocktail of hormones involved in breastfeeding and mother/infant bonding, the hormones prolactin and oxytocin are most important for milk production. While prolactin is known colloquially as the hormone of tender nurturing, oxytocin is often referred to as 'the love hormone'. And it seems that the withdrawal of these two hormones, which give mothers a sense of calm as well as promoting milk supply and encouraging a strong connection with their babies, could be the link to post weaning depression.

Alison Stuebe, an obstetrician-gynecologist at UNC's Gillings School of Global Public Health, led a pilot study which found that depressed mothers produced less oxytocin during breastfeeding. That research, published in the Journal of Women's Health, "raised the interesting question of whether there is something wrong with a woman's oxytocin production that is making her anxious and depressed, or is the anxiety repressing the oxytocin," Stuebe said.

While this study investigated the link between depression and oxytocin in women who had 'failed' breastfeeding experiences, Dr Stuebe said that we don't have the data that measures oxytocin levels with breastfeeding and weaning.

"It's certainly plausible that losing that is going to make people feel physically bad, independent of any cognitive sadness they're experiencing," she said.

The good news is that unlike postnatal depression, which can take months or even longer to recover from, post-weaning depression seems to be short-lived. Although it can be debilitating, it usually resolves within weeks as women's hormones rebalance.

In her blog, A Cup of Jo, New York mum Joanna Goddard describes how after about six weeks of feeling utterly debilitated by post-weaning depression, she simply woke up one morning and it was over. "It felt like I had been swimming in a pool, and suddenly - woosh! -I had resurfaced and my head had come back out of the water, and I could see the bright sun and breathe in the fresh air again. It felt like waking up from a bad dream. Suddenly, I was myself again. That Tuesday morning, I woke up, the sun was shining and I felt happy again. My depression had just ... ended.

"And the crazy thing was: I got my period the very next day, for the first time in over a year and a half. It was as if my hormones had finally figured themselves out, and boom! I was back to normal."

For other women, though, medical help may be necessary to overcome depression. This is a quality of life issue, and if low moods, mood swings and symptoms of depression are present for more than two weeks, it's wise to seek help.

Of course, many women will wean babies without any psychological side effects, apart from the normal sadness that goes with realising your tiny baby has grown into a little person who needs you in different ways.

The best way to wean and avoid sudden hormonal withdrawal is to consider the mantra 'gradually, with love', dropping breastfeeds slowly over several weeks or longer. A good rule of thumb is to drop no more than one feed a week.

And to help you stay chemically balanced, try implementing other activities that will release oxytocin, the 'love hormone' - cuddling and intimacy with your partner, massages, sharing fun and food with friends, as well as eating healthy foods and exercising to boost your endorphins.

Pinky Mckay is an international Board Certified Lactation Consultant and best-selling baby care author. She has a wealth of breastfeeding information and a free ebook 'Making More Mummy Milk, Naturally' at boobiebikkies.com.au.