It is the number of milk teeth in an infant’s mouth.
ɪ t WORD_BOUNDARY ɪ z WORD_BOUNDARY ð ə WORD_BOUNDARY n ʌ m b ə ɹ ɹ WORD_BOUNDARY ʌ v WORD_BOUNDARY m ɪ l k WORD_BOUNDARY t iː θ WORD_BOUNDARY ɪ n WORD_BOUNDARY ʌ n WORD_BOUNDARY ɪ n f ə n t s WORD_BOUNDARY m aʊ θ WORD_BOUNDARY