It's not related to the knock on the head. Anything severe will surface within 24 hrs or even 48 hrs. Some vomit milk is normal because at this age they can be quite active, maybe tummy time to fast or took a long time to finish milk (drinking and pausing a lot) can introduce air too. Extra sleepiness at night is ok too. Their sleep patterns will keep changing
The vomitting of milk is a little bit or he projectile vomit the whole milk intake? Secondly for the sleepyness you don't have to worry, if he is also equally sleepy during the day, then you need to be more alert. Probably he is tired and needed more rest.
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I would assume nothing is wrong if no signs come up after 24 to 48 hours. Also if you had been to the doctors, nevertheless no harm to get a second opinion.
thanks
Jorelle Aw