Q：When can parents train babies to sleep through the night?

A：Most parenting experts recommend that parents start sleep training when their baby is 4 to 6 months old. 

When the baby is 4 months old or so, they basically have more regular sleep habits and the ability to sleep through the whole night. Of course, there are some babies who are unable to sleep through the night after they are1 year old, so there are individual differences in babies whether they are able to sleep through the night. 

If parents have no idea on if their baby is ready for sleep training, they can consult a pediatrician for advice.