Hi, and welcome to the Forum!
I know we've given you a lot to think about, but I'd like to give you some different advice.
I'm pretty sure your baby is too cold. You need a thermometer so you can be sure of the temperatures all over the floor of his habitat. Baby tortoises need to be at LEAST 80F degrees. Warmer than that is even better. I'm sorry, but a 40watt bulb just doesn't do it. You need at least a 100watt bulb. And if you cover the habitat the heat will spread out all over the habitat. Then you also need to keep him warm at night. So you need a night time heat source along with the day time heat source.
Your baby is very sick. You're going to have to warm him up very soon or he's going to die.
I know we've given you a lot to think about, but I'd like to give you some different advice.
I'm pretty sure your baby is too cold. You need a thermometer so you can be sure of the temperatures all over the floor of his habitat. Baby tortoises need to be at LEAST 80F degrees. Warmer than that is even better. I'm sorry, but a 40watt bulb just doesn't do it. You need at least a 100watt bulb. And if you cover the habitat the heat will spread out all over the habitat. Then you also need to keep him warm at night. So you need a night time heat source along with the day time heat source.
Your baby is very sick. You're going to have to warm him up very soon or he's going to die.