How fast to up food size?

[TanyaL]

Definitely!
As soon as I get my scale and get him eating a few more meals then I'll throw in weight updates.
But if you look at pictures like this.. which I took a week before he ate (sorry to hijack!) http://i23.photobucket.com/albums/b3...2/DSC03794.jpg

OP: So if you follow either rule with the weight percentage or the size comparison, either way you'll probably notice a gain of weight one way or the other and move up as he grows. :]

I am willing to bet that you converted wrong. Without something next to your bp to compare it makes it much tougher to see how big he really is. Our BP is about 8 months old and weights only 316ish grams and I'm starting to get worried about her weight where she is now. I would think that if yours is indeed as small as you think it is, you would know for sure that there is a problem.