You can use books/boxes under his feet to get him into a squat position, especially if he's using the little potty. You can also look into the Squatty Potty, a lot of people swear by it even for young kids.
Proud Formula Feeder, I support how ALL parents feed their babies. Breast or bottle, formula or breastmilk, and any combination thereof.
Happily married since 4/30/2009 Our first was born 4/23/2013
My son was different and would only stand while pooping. During his potty training, we had lots of poop on the floor (we went with keeping him naked). I just paid a lot of attention to him during that time and as soon as he looked like he was pooping I'd rush him to sit on the potty. Never made him feel bad for the poop on the floor, but just kept saying "poop goes in the potty, not the floor." And then if I made it to the potty in time to get some in, we'd really celebrate. Even today 7 months after being potty trained, he still gets really excited after a poop. He was pretty agreeable through the whole process and willing to learn, so that helped a lot.
Happily married to DH
Stay-at-home mama to DS1 (01/12) & DS2 (01/14)