So a family of cats invaded my backyard this summer and took over a groundhog hole. Next you know there are kittens. There was one kitten that was soooo much smaller than the rest. A runt or just was not getting fed by the mother. I mean this kitten was three months old earlier this fall and was literally all bones. I knew it wouldn't survive so I started feeding it. It came to the door dutifully in the AM around 8 and PM around 5. Slowly she began to gain weight. As the fall wore on the mother left, then the one other sibling, then finally the father left a month ago. By this time the kitten was allowing me to pet it while she ate. I decided to take the kitten into my home and "adopt" her as I don't think she would have survived the winter. I am taking her to get her shots and fixed come the middle of January. In the meantime she is eating fine, playing, sitting on my lap as any other normal kitten would do. She also took right to the litter box which shocked me. Right now she is about 5-6 months old. The thing is after finishing her food in the AM she begs to go outside. She goes out, crawls in the groundhog hole where she was probably born, then comes back to be let in at around 4PM. Crazy. I am afraid she may go into heat before she is fixed. At what point do I stop letting her out? I know the signs of a cat going into heat but you never know. Any help is appreciated.