teeth between 13 & 33 months old webmd.com Dental Health- Your Child’s Baby Teeth 6 years first molars WebMD back molars between 13 & 33 months old all 20 of their baby teeth webmd.com webmd.com growing primary teeth from 6 months to 3 years eruption of the first tooth ages of two and three child’s dental development losing their teeth all 20 of their baby teeth child’s oral health web md complete set of baby teeth