I have heard two different thoughts on the age of the females being bred. One side argues that a "responsible" breeder wont breed a female rat till she is 10-14 months old (this is done to allow time for any possible health issues to rear their head as well as to tell the personality of the rat if you are breeding for more of a pet approach than a feeder approach) The other side argues that waiting to long for the female to have pups can prove detrimental as the body adapts to the lack of birthing (things harden and shrink...not scientific terms but you get the point lol) I personally breed them shortly after they are physically able.Mine are usually in the 8-10 week range when they first get prego, this young age will lead to a smaller first litter but it gives me a quick idea of what kind of mother the female will be...I would rather feed off a bad mother after 4 months of feeding that waiting 16. But yes the age yours will be will be perfectly fine for a first litter.
As far as not sneezing that is good, hopefully they have no respiratory issues. Sorry I kinda went off topic a bit but I started typing and went with the flow
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