How old is the child? 5 years old? At that age, child should be able to handle overnights with dad pretty well. You need to push for overnights in court. Make sure to have something in writing in parenting plan that says that illness of child won't be a cause for denying visitation. Your DH can provide comfort and care as well as BM (but of course, that doesn't make much sense if you guys don't have overnights). Does BM have sole custody? It seems so since you talk about "visitation" instead of "parenting time". If BM denies visitation due to illness, you should have a clause in VO to establish make up time. If she doesn't give you make up time, then file for contempt. Court is expensive and stressful but if you don't put a stop to BM now, she will continue doing whatever she wants. Fight to get more time with child.