When can I start washing my kids clothes together with the adults' clothes?

It is recommend to separate it for at least a year. It is actually up to individual. If your baby isn't having any skin problems , you can wash together and you can even use regular detergent/fabric softener. I used the baby detergent for all baby loads for the first year or so and then switched to the regular mixed loads after that. Adult clothes are usually more dirty and it also depends on the industry the adults are working in. Like my hubby, he is from the waste mgmt and i washed his alone. I have a total of 4 kids, I washed my 3 elder kids clothes as 1 bundle and my infant separately as of now. I practically wash clothes almost everyday else alternate days.