Personally I wouldn’t do that, because I would have used the refrigerated milk within 48 hours without freezing it (that’s my preference because I was worried my baby would get stomach flu). But I think this means the refrigerated milk should be frozen within 24 hours. Ideally, the milk should be frozen immediately after pumping, but if you’re combining, then preferably within a few hours, and sterilise your hands while handling. I think this might be the best to prevent diarrhoea.