When life gets in the way of intervention efficacy

My fantastic field assistant and his wife had their first baby two months after the start of the (year-long) intervention. I'm proud that we both work for an organization that gave him paternity leave. Now, four months after the start of the intervention, he has a bad case of malaria.

I'm worried about the size of the detectable effect on outcome variables, but health and babies are more important. Too bad good health doesn't get you three stars on a regression output table.