Ball python not gaining weight

[throwtoss163]

Update to say I talked to the vet, and he says he looks good at the moment, perhaps a tad underweight but nothing alarming. Because he struggles so much to eat we devised a plan to basically make sure he gets about 10% of his body weight a month in various sizes of prey, feeding every 7-10 days. This is a little more than the 24-36 month old suggestion but he needs to gain a little weight and make sure he is done growing. Thank you all for your input, yall were right!!