Babbles, smiles, and rolls, oh my! Your 5-month-old baby is becoming more active and personable each day. By 5 months, they're a certified pro at crying, eating, pooping, and—hopefully—sleeping.

Justin Bieber delighted fans with rare glimpses of his 5-month-old son, Jack, in Instagram posts on January 21. The photos captured the pop star enjoying wintertime with his wife, Hailey Bieber, and ...