To be fair, this is not “injury to a child.” Injury to the mother without a doubt, but a fetus is not a child.
I can see how it would be justified to increase penalties for assault / etc. against pregnant people, but a fetus is not a child.
Edit: I don’t care about the downvotes. This is an awful situation and the penalty he received seems way too low but consistency is important. A fetus is not a child. If you disagree, you don’t get to participate in the conversation.