Girls, I have a question. Yesterday after bathing the baby, I was putting…

Girls, I have a question. Yesterday after bathing the baby, I was putting on lotion while my husband came in and fell asleep on the bed. While I turned away to get cream, my husband bent the leg and with his knee hit the baby's head. The baby started crying loudly, I quickly took him into my arms and he calmed down, ate and then went back to sleep. I watched over him all night and throughout the morning, the baby was calm, there were no vomiting episodes, no bumps on the head either. Has anyone ever encountered something like this? Maybe it would be worth doing an ultrasound of the head?