Infants and toddlers are not expected to be able to use all of the sounds that adults use in speech. However, there are certain sounds that most kids should be able to use with consistency. Here is a chart of some approximate ages that children should acquire sounds by (at the beginnings of words).
12 months: b, d, g, n, m, h
24 months: b, d, p, t, k, m, n, h, w
36 months: p, b, d, k, g, m, n, h, ch, w, l, "y" as in "yellow" and "th" as in "the"
McLeod, S., &; Bleile, K. (2003). From 2003 ASHA Convention: Neurological and developmental foundations of speech acquisition.
12 months: b, d, g, n, m, h
24 months: b, d, p, t, k, m, n, h, w
36 months: p, b, d, k, g, m, n, h, ch, w, l, "y" as in "yellow" and "th" as in "the"
McLeod, S., &; Bleile, K. (2003). From 2003 ASHA Convention: Neurological and developmental foundations of speech acquisition.