You can Zard, but it's not reccommended as a main diet. You might need a few for good sized meal for 3 yo. dep on species. people do feed em as a treat but apparently there is not alot of nutrition in them and people claim it can give pythons diahreah. Rats are better, your 2-3 yo could be eating rats of appropriate size now, rather than a few mice each feed.(unless you meant rats and I misunderstood)