If your child is not sleeping through the night by three or four months of age, when most full-term infants have “settled,” it may be time to start thinking about what could be causing the problem and, perhaps, to begin to correct it; if more than occasional wakings are still happening when your child reaches five or six months of age, you not only can but probably should take definite steps to address them. If you do nothing, his sleep will eventually improve on its own, but the process could take months or even years. If you can figure out why your child is sleeping poorly and make the
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