When mom or dad says, "Mama" or "Dada," and the baby doesn't imitate it, that's a warning sign, says Agin. Don't become overly troubled if a young child doesn't clearly say "l," "r," and "s" sounds.

Speech and Language Therapist Laura Black says, “Baby signing has become more popular in recent years. There are lots of reasons to sign with your baby. Parents can find they are more tuned in ...