My bp was skinnier than that when he refused to eat for weeks and he too was a baby at the time. Also, he looks wrinkly... Could be a sign of a shed coming up, which can contribute him not wanting to eat (for now). A hungry and ready to eat bp is usually found hiding and waiting. If it is wandering around during mealtime, and of course it did not take the food, I would double check your husbandry plus how you warm up your food. Personally I would move him to a small 6 qt tub especially that he may be in shed soon.