Although biting and hitting are common concerns.  Children with speech delays are even more likely to exhibit “behaviors” like biting and hitting because they just don’t have the words to communicate. All behavior is communication.  It’s helpful to view behavior through this lens because it helps us find ways to address the underlying cause.  In children with speech delays, can help them find a way to communicate in a moment of frustration. Here are a few ideas: 
1) Teach your child “power words” (and gestures): Words like “no,” “me,” and “stop!” can be helpful during frustrating moments. Even if a child is using some of these words at home, language takes a backseat when we are frustrated and they may not be able to access the words. Teaching a gesture along with the word can be helpful for this reason.
2) Make a social story: Social stories are great because they can be tailored to specific situations.  They can be personalized with a child’s name and picture, making them even more meaningful! Social stories teach exactly what to do in a new or difficult situation. That way a child can practice what to do when there is no emotion involved. You can easily make one any word processor by inserting photos and adding text. Then print it out and read it with your little one. Here is an example of one:
3) Read books about biting/hitting: There are a lot of great books that focus on what to do instead of biting or hitting. The key Here are a few:
4) Give them something else: Sometimes children are seeking input in their mouth because it is calming. Even as adults, we may eat when we are stressed!  If it seems like your child is seeking oral input, give them something that is okay to bite/chew instead. Here are a few ideas:
Does Your Child Need Help?