After a snake eats they feel very vulnerable and will regurgitate their prey. You need to give your snake 24-48hrs to digest.
Not knowing his exact size at 4mths a mouse every 5-7 days should be fine, but you should think about switching over to rats and a weanling or crawler should be a good size for him or you will be feeding multiple mice every week soon.
The tucking his head in is how they got their name and is a defensive posture, most are shy.
lol while I was typing others replied! All good advice
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