Being big or small at birth does not imply that the baby will be big or small in infancy or as an adult. Quite a few tall teens started life as small babies, and the largest baby in the family may turn out to be a short adult.
As adults, children tend to resemble their parents in size and stature. The genetic as well as good nutrition and attention and care you receive will play an important role in how your baby will grow in the future.
Whether your baby starts out big, small, or a size in between, expect your little one to grow by leaps and bounds in the months ahead.