what size bike to buy my kid?

[jessika t]

my son is two and very small for his age his inner leg measures 11in or 28 1/2 cm he weight is 23 lbs i was wondering if i should buy a 10in or a 12in he wont be riding it till this summer really but i don't want him to get hurt if it is two big.. i have gotten on several web sites and none show a leg length as small as his one site said 14-17in is a 12in bike age 2-3 but he only has a 11in measurement so please help...