When does a child lose his first four teeth (the top two front and the bottom two front)?

Varies: Most children start losing teeth around 5-7 years of age.Each individual is different but most lose the two lower first then the two upper.

About 6: The central incisors exfoliate (fall out) at about 6 years of age. But all children are different. Don't be concerned if this occurs slightly before or after 6 years of age. Take your child to the dentist every 6 months for optimal dental health.

Ave 6 yrs: That can be off by a year more or less.