Probably some teeth: Teething can appear in babies from the ... there are always things you can do to prompt and encourage 4-month-old baby development by following certain best practices.

"A 4-month-old baby should be given the opportunity to ... In addition to sleep regressions, teething, growth spurts, and schedule changes can all disrupt your infant's sleep.

A teething baby may have ... babies are born with a few teeth. Baby teeth, also called primary or milk teeth, begin to erupt in phases between 4 and 7 months of age. Most children have a full ...