As I remember there should be >= 5 words by the age of 18 months. If not, parents should pay more attention to the kid's language development. If no improvement until 21/22 months you should seek help from a specialist. It doesn't seem to be related to the fall though.
S*F
17 楼
My son spoke a few words when he was 1 1/2y, then stopped, which drove us crazy. You can call the township about "early intervention program", which will send someone to your home for evaluation. They are very experienced in those areas, better than any peds. They helped my son a lot, now he is 4 1/2 , and has caught up mostly.