How do we get our almost 8 mo old son to sleep better at night?

He takes 2 naps during the day for about a total of 3 hours. He usually goes down at night by 9:30, gets up around 8:15 am. Lately he has been getting up at least 2 times during the night (usually to feed.) Recently he has started crying when we put him back down at night. For a while he was only getting up 1 time to feed, then would promptly go right back to sleep. He gets plenty to eat during the day, about 2 jars of Stg 2 food plus some oatmeal or small pieces of fruit or veg and feeds 3-4 times and has recently started taking less (5-6oz) of formula/milk combo in bottle. He used to take a full 8oz. His recent night habits have been starting to interfere with my husband's sleep who really needs his sleep to function at work. I am mostly a stay at home mom who does the majority of the during the night duties. I really don't think I could get him to eat any more during the day since he already is a chow hound! Any suggestions??