Trying to get pregnant? Make sure you know the bottom line on baby-making—what you don't understand can affect your bub-to-be's health.
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During the second trimester, your baby begins signaling its presence. Between weeks 16 and 20, most women notice a fluttering that may be mistaken for gas. Between weeks 20 and 22, you feel kicks, turns and other movements, and between weeks 23 and 27, they come in waves as the baby develops waking and sleep patterns. (Call your doctor if you don’t feel the baby move by 22 weeks.) Between weeks 18 and 22, your doctor will use ultrasound to gauge your baby’s development and check for visible problems. Three percent of babies have a major anomaly, Stone says, and ultrasound can detect two-thirds of them.