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Baby Development: Your 4-Month-Old

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Your 4-month-old is growing more and more alert by the day. Babies at this age love to express themselves through smiles, laughs, gurgles, and coos.

This portion of WebMD’s month-by-month guide describes a few of the baby milestones you can expect your child to reach at four months.

Baby Month by Month

Girl and Boy Baby
Your baby's first year will be full of joys and challenges. WebMD pediatrician Steven Parker, MD, explains what you can expect as your baby grows and develops.

Fourth Month Baby Milestones: Growth

By month four, your baby’s weight will likely have doubled from birth. If you’re concerned that your child isn’t eating well or isn’t gaining enough weight, talk to your pediatrician.

Fourth Month Baby Milestones: Motor Skills

Your baby is becoming more dexterous and doing more with her hands. Her hands now work together to move a toy or shake a rattle. In fact, those hands will grab for just about anything within reach, including a stuffed animal, your hair, and any colorful or shiny object hanging nearby. You might want to remove any earrings or necklaces if you don’t want to experience a painful tug.

Anything your baby is able to pick up will likely end up in her mouth -- tasting is one of the ways she explores her world. It’s crucial that you don’t leave small items lying around that baby could choke on. Anything that can fit inside a toilet paper tube is too small to be within finger’s reach of your 4-month-old.

By now, your baby’s head should no longer be wobbly. Four-month-olds have pretty good head control while sitting supported, and they can hold their head and chest upright while lying on their stomach during tummy time. They also can kick and push with their feet. Some babies have even figured out how to roll from tummy to back at this point.

Fourth Month Baby Milestones: Sleep

By your baby’s fourth month, you both should be enjoying a full night’s sleep. At this age babies typically can sleep seven to eight hours in a row. Add in two naps, and baby should be sleeping a total of 14 to 16 hours a day.

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