You might want to try supplementing with Mazuri or ZooMed grassland, mine never turn that down. Also, make sure that you always have drinking water available as well as daily soaking. The indoor air is very dehydrating at this time of year and hatchlings are very vulnerable to dehydration. Are you using UVA AND UVB lighting? That can also make a difference. I also have 2 young sulcatas, 7 months old. Good luck!