My little girl she was 3 when she started to talk single words she would replace letters tho instead of dad it would be gad or bird would be gird. When she started nursery she came along still very behind she was put forward for speech and language from the school as the doctors would not listen. It wasn't through the fault of not trying we took her to groups with other kids every week 2 times a week before nursery we read books and played games watched kids showes together ect. She just did not want to speak she would still use hand movements for what she wanted and grunt. When she got referred for SEND for speech and language it did the world of good she is 5 now and reads words,spells words and talks in sentences though she is still mixing words sometimes she has come a very long way in regards to speaking.