I gather that you are BF, right?
It's normal for BF to need to feed more frequently, and some babies need a top up rather than a feed before S. If you are concerned that he will associate feeding with sleeping you can have a little bit of A time after the second feed, even just a nappy change to make sure he goes down awake.
If weight gain is ok and your ped. is pleased then I wouldn't worry about it right now, he will be able to space the feeds more as he grows older.