Not sure of the guidelines but all of mine have started with dad and then mum. Dd3 is 15months old and says about 20 words. She calls DH and I mum and dad and refers to her siblings by their name. She will say poppy and Mema and call them by they name to get their attention. She says please for things and when you give her things. She also know words to songs. Everyone after dd1 talked well said that she would talk for the babies but it's the opposite here. My kids don't shut up

BUT

Dd3 wAs so slow at other things. She still only has four teeth!

They can't be quick/good at everything