When newborn babies cry, do they produce tears? Answer: No, babies do not produce tears until they are 4 or 5 months old. How early can Baby identify Mom’s voice?Answer: Babies as young as 2 days can identify Mom’s voice from a single syllable. How fast does Baby’s brain grow?Answer: Baby’s brain will double in size during the first year of life. How many bones does Baby have?Answer: When babies are born, they have 300 bone; adults have 206. How often does Baby urinate?Answer: A newborn urinates about every 20 minutes. When does Baby start to smile?Answer: Baby’s first social smile appears between 4 and 6 weeks after birth.