red tailed boa

Question
my redtail is almost 4 months and i last fed him Friday but the Friday  before he regurgitated his food so this time we fed him a pinky rat and it took 30 minutes for him to eat what is wrong with her

Answer
Regurgitation is often a sign of a serious issue--either extreme stress, or parasite infestation or infection.
Never handle the snake right before before, or directly after it eats, apart from briefly for cage cleaning (wait at least 2 full days before handling).

If handling and stress are not the issue, then your boa should be taken to a reptile-experienced vet promptly, along with a fecal sample, for a full health check and parasite test.

Regurgitation is extremely hard on a reptile's body, because their stomach acid is so intensely powerful, and it can damage their lungs if they aspirate any of it.  In general, if your snake regurgitates, wait 2 weeks before offering food again.  It is absolutely crucial to identify the cause, and treat it.

A 4 month old boa should be eating larger fuzzy rats, so a pinky rat is a small meal for one, but it was probably an appropriate choice, because of the regurgitation.  Make certain not to overfeed your boa--it should eat only once per week, and should not be given an oversized prey item.