@Sara my son says dada intentionally. He says mama but tends to use it as an all purpose word (he knows I'm mama and when asked where is mama points to me). He says yum yum. He doesn't imitate sounds much when asked, by us or the speech therapist. He is signing a little more but isn't consistent using a sound with the sign. He understands Everything.
My daughter has a speech delay. She will be 2 in July and only started saying “More, dada, mama and baby. She’s been in early intervention since she was 14 months and started private speech therapy 2 months ago. Shes started signing and babbling a lot more. I am hoping she starts talking more. But I’ve heard from other people that some kids won’t start talking till they’re 3. She seems to understand English and Spanish.