What developmental milestone is typically observed in a baby by two months of age?

By two months of age, babies typically exhibit the ability to push up with their arms when placed on their stomachs. This developmental milestone indicates that the baby is beginning to gain upper body strength and starts to develop muscle coordination. At this age, they may also lift their head upright to about 45 degrees while lying on their stomach, demonstrating increasing control over their neck and shoulder muscles.

Rolling over, sitting up, and crawling are all milestones that usually occur later in development. Rolling over generally begins to happen around four to six months of age. Sitting up typically develops closer to six months, as the baby needs stronger core muscles and balance to hold this position independently. Crawling usually starts around eight to ten months, as infants refine their motor skills to move across the floor. Thus, pushing up with arms is the milestone characteristic of a two-month-old baby.