Honey was the same size when I got her and she is now 3.8 pounds. She is very healthy now and didn't do to bad. I did have a
Hypoglycemia problem once but the vet and the breeder told me to just give her syrup on a soon and it worked really good. A lot of people prefer to use Nutrical but I never used it. I think you will be fine as long as you or someone else is able to watch your dog when you are not able to. To my understanding
Hypoglycemia can happen to all toy breeds and it normally comes from the stress of being in a new home. I think you will be fine bringing you new baby home.