A 15 month old child can do all of the following, EXCEPT:

By 15 months babies learns to feed himself with spoon without spilling its contents, can say 3 words, creep upstairs. By 15 months they can built a tower of 3 blocks, they built tower of 2 blocks by 1 year. Language development: 10 months: Dada or mama 12 months: says one word other than mama or dada 13 months: 3 words 16 months: 6 words Motor development: 3 months: Lift head with good control 6 months: Sit independently 9 months: crawl 1 year : walk 18 months: runs Ref: Goldson E., Reynolds A. (2012). Chapter 3. Child Development & Behavior. In W.W. Hay, Jr., M.J. Levin, R.R. Deterding, J.J. Ross, J.M. Sondheimer (Eds), CURRENT Diagnosis & Treatment: Pediatrics, 21e