Thanks for your observations. Just to be clear, he leaves five out but often (but not always!) knows that 6, 7 and 8 come next. But he doesn't get to ten and instead starts to repeat numbers at random after 8 or 9. My older son also skipped 13 for a while but he could count to much higher numbers (I think he had a hard time pronouncing it). This one seems like he cannot really count to ten. In fact, he cannot consistently and accurately count past four. We will continue to practice counting as it comes up but I find it so odd that, of all things, this won't stick.

For what it's worth, he seems to get other age appropriate math concepts. He has one to one correspondence and can manipulate numbers up to five. He can even add three numbers that have a sum of five (he often tells me that 2+2+1=5). He can identify most numbers up to 100 (he loves to look at book page numbers and identify them). The problem seems to be remembering a sequence of numbers or something like that.

Last edited by Lepa; 01/20/16 11:52 AM.