baby shorter than expected

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My boy has always been over 50th percentile in height since about 2 months old, the last (6 months old) being 92%. He had his 9 month appointment on his 10 month Birthday and he went down to 27%, in fact he only grew .3" in 4 months. I figured the 92% from his 6 month appointment was right after a growth spurt but I'd expect him to at least go back to the 50% has anyone else seen such a fall in height percentile?