Serious issue moment or idk

I was holding my child 👶🏻 as I walking to drop him off at daycare. He was in my arms and threw himself back. In essence he basically did a whip lash. I am so worried. It was a very hard one and I know they are so fragile when they’re this little. I am so torn on what to do. The FTM instinct in me is making an appointment.