Are these normal behaviors for an almost four year old, or should I be worried?

My sister and nephew were in a car wreck last November. She didn’t make it and it left my nephew with a serious brain injury. My mom and I are now raising my nephew together.He’s been through months of therapy and went from not being able to move anything but his eyes to running around like a maniac.My mom seems to think that my nephew’s outbursts aren’t normal and that he’s behind developmentally. The problem is that my mom is a MASSIVE hypochondriac who is constantly looking for an issue or blowing something minor up.I’m trying to be rational about this, but it’s hard not to freak out. We have an appointment with his pediatrician to discuss these issues, but I want to put everything into perspective for myself before we go and my mom tries to make mountains out of molehills.The things she brings up are:He gets these big bursts of energy and will start screaming and running around and it’s really hard to get him to calm back down and listen-He spaces out sometimes. Like he will just stare off into the distance and it takes a few tries to get his attention-He cries and throws temper tantrums at the drop of a hat. I mean serious mood swings over the smallest things.-He will bite/hit/pull hair out of the blue and then seems surprised that he does it. He doesn’t even have to be angry. Just whenever he gets really energetic he’ll latch onto my arm and then he pulls back and says sorry immediately like he didn’t realize what he was doing.-He can hold silverware, but has trouble not spilling it and gets frustrated about not getting big enough bites so he’ll either use his fingers or tell an adult to feed him.He has a pretty good vocabulary, but his speech is a little garbled (its hard for people who don’t speak to him everyday to understand him and when he learns a new word it’s hard for us to understand what he’s saying. We’re going to ask about speech therapy for this, but I’m not sure how serious it is) and he still uses baby talk like “me has to go potty”He wants to play with baby toys more than toys meant for his own age. Especially the thing that has different buttons that make animals pop up.I’m sure there are others, but that’s all that’s coming to mind right now. I know next to nothing about kids and I feel like I’m in way over my head. Are these normal behaviors for an almost four year old? Is it his brain injury or his he just reacting to our grief and fighting (it’s been tense being back at home)? Am I just really shitty at parenting and royally fucking up? Is there anything I can be doing to encourage his development?Any and all advice is greatly appreciated. via /r/Parenting https://ift.tt/2POqFyg