You're a pro at changing dirty diapers now – both varieties. You can bathe a slippery baby solo – and you've even started using soap. You're doing it all on less sleep than you ever thought possible, and it's starting to feel natural.

And your baby? Pooping doesn't scare him anymore. He's got the basics of eating down, and he's starting to get the hang of sleeping. He's discovered that there are two (or more!) very nice people in his world whose sole purpose is doing whatever it takes to keep him happy. For the 3- to 6-month-old, life is good.

During the 3-to-6-month period, your baby's main developmental task is to form relationships, says Beth Teitelman, Director of the 92nd Street Y Parenting Center in New York City and co-author of Wonderplay: Interactive and Developmental Games, Crafts and Creative Activities for Infants, Toddlers and Preschoolers (Running Press, reissue, 1995). "What she's learning right now is that the world will meet her needs, if she expresses them," Teitelman says. "And the world is you, at this point."

Your baby is getting interested in the world around her. Mirrors are particularly fascinating. "She loves to look at herself in the mirror," says Cassandra Lott of Williamsburg, Pa., when describing her 6-month-old, Georgia. "She plays a sort of game with my dad where he takes her to the mirror then pulls her back, then close again."

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