Your Baby's Milestones

Average age: 6 to 7 months

"My first child, Parker, sat up by five months, so I was worried when Mayli couldn't do it at the same age. She was wobbly at first, but eventually she got it. I stopped comparing my kids after this."
-- Cassi Willoughby

"If your baby can hold up her head and push herself up from her tummy with her arms, she's probably ready to try sitting up," says Paula Jackson, a certified nurse-practitioner in Philadelphia who specializes in early childcare and safety. You can prop her up with pillows on the floor at 4 months (stay close by!) or have her lean forward with her legs apart, supporting herself with her hands. That'll help her learn to balance.