Toddler possible head injury and vomited once.

Hello all.

My son is 22 months old, average weight and height. No health concerns or previous health concerns.

My son was sat on our window ledge looking out the window (2 feet off floor roughly) and fell backwards down onto his raised wooden slide, he definitely hit his back and had a slight red mark but possibly could have hit his head in the process.

He cried for a few minutes then was fine, running around, wanting to play on his slide, talking, playing with the cat.

Roughly 20 minutes later he had a bath we got him changed and took him to bed, he has a cup of milk right before bed, he drank all 7oz of his milk and sort of right after started swallowing quite a lot so I assumed he was going to vomit, he did vomit up all his milk (and some baked beans he ate 40ish minutes earlier.

After his one episode of vomiting, he was fine and was talking to us, wanting to run around but sat on n the chair talking to us whilst we cleaned the vomit.

I gave him some baby nurofen, a few glugs of his water and put him to sleep without thinking, he’s now asleep and I’m absolutely shitting myself.

Can I monitor at home or should I take him to ER? Should I wake him up from his sleep?

Thanks in advance