It is detrimental to give a baby a sugary drink during a nap or at night, as the flow of saliva is reduced during sleep, leaving the sugar-containing liquid to remain in the child's teeth for a long time. If left untreated, it can cause decay, pain and infection. Serious decaying teeth may need to be extracted. Your child may experience poor eating habits, speech impairment, tooth flexion, and adult teeth damage if the tooth is infected or prematurely lost due to tooth decay in the baby bottle. Healthy baby teeth often result in healthy permanent teeth.