I’m the parent of a 15 month old boy who has about 20-30 “words” that he’ll say unprompted, but many share the same sounds. He can say b, p, m, n, d, k, g but will use “gah” or some variation of it to refer to various things. He also doesn’t have the “ee” or “ey” or “ai” vowels and all his words are consonant-vowel (never end in a consonant). Is this normal for his age?