For a 3 months old I'd recommend temps a bit cooler, like between 80 and 82. I would gradually increase the temps to 85 or 86 as an adult if you have a male. I keep females in the low 80's even as adults. I'm attaching my blog for new keepers below. It will help you to keep your little one healthy.
Sage, Lottie, Spike, Amos, Andy, Cooper, Hendershot, Tate, Red, Dulce, Teddy & Bart RIP: Hera, Jr, Sadie, Sid, Luie, Mufasa, Padre, Elly, Camille, Bertha & Joppa