Children benefit greatly from open-ended time where they are in their parents' view but have some independence in solving problems and determining how the play proceeds.

Your Growing Child: Birth to Three Months
Developmental milestones are physical and emotional behaviors children display as they grow. Keep in mind that children develop and grow at different rates.
As the parent of an infant, you've no doubt been watching your little one very closely. You’ve seen how your baby is learning from the world around him every day.
Within the first three months, your baby will begin to smile and track people and objects with his eyes. He may also discover his own feet and hands as well as develop the ability to lift his head and turn towards sounds.

Most babies gain about six to eight ounces a week for the first few months. At each well-baby checkup, your doctor will chart your child's length, weight, and growth rate (how her size compares with other babies her age). Your doctor will also ask you questions about your baby’s development to ensure that he is meeting his developmental milestones.
Developmental milestones are physical and emotional behaviors children display as they grow. Keep in mind that children develop and grow at different rates. However, on average, children tend to reach these milestones at around the same time.
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