is yoru lo waking other times at night as well? if not, try a dream feed, this is when before you go to sleep at night, or after your lo's first feed in the night time, you take them while they are still sleeping and feed them. if you are botle feeding you can leave them in the crib and do it. they will "top off" and this may help him getthrough to 7 without waking at 4. if this does not work yo ucan try wake to sleep method. you can read about how to do it in the baby whisperer tells all book. this method works well when the baby is waking due to habit rather than hunger.