Welcome to YT and congrats on your new additions.
As others have pointed out, you girl is too small to breed (safely). General rule of thumb amongst reputable breeders is not to breed a female under 5 pounds and even THEN there are the matters of pelvic structure and genetics to consider. (Among other things!)
I would hope this would have been something your breeding mentor would have covered with you. If you don't have a mentor, I suggest you get one. If you do and he/she gave you the go ahead, FIND A NEW MENTOR!
Please consider what is the best option for your little ones and not just what you *want.* There is loads of information here for you to educate yourself with and tons of storys to share.
