Sims standing around instead of taking care of infant/toddler

My sims recently had twins and whenever I click on an action or task for them to complete concerning the infants, they won’t complete the task, or will only attend to one twin. Every time I change a diaper, it still says the infant has a bad diaper, and it wont let me put them in cribs. So I keep having to cheat to make sure their needs are met.