Baby's starting to show more control of her head and neck muscles. You can see this in action when you lift her up from her back — her head and shoulders should follow your direction. Also, as her spine continues to straighten, she may start to successfully sit up with or without support.
[tip] Make sure baby's toys have a diameter of at least 1 1/2 inches (or 4 centimeters) so that she won't choke when she puts them in her mouth.
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All medical information reviewed by Dr. Paula Prezioso of Pediatric Associates in New York City