When Paula Radcliffe won the New York City Marathon in 2007, nine months after giving birth to a daughter, Isla, Radcliffe was considered an anomaly. Her intense training through her pregnancy, which included twice-a-day sessions and grueling hill workouts, was scrutinized and criticized.

Seven years later, maintaining a top running career and a family has become relatively common. About a third of the women in the professional field of 31 for the New York City Marathon next Sunday have children.

“I watched Paula win New York, basically leading from the starting gun to the finish tape, and afterward she picked up her baby,” said Kara Goucher, a top American marathoner. “I realized I can do both. And I want to do both.”

Goucher, 36, finished third in the 2008 New York City Marathon, and this year she will run the New York race for the first time with her 4-year-old son, Colt, cheering her on.