What's Your Least Favorite Part of Parenting? Did you find new parenthood — navigating the ins and outs of handling an infant — to be most challenging? Or maybe it was trying to reason with a toddler? For this mom, one of the worst parts of parenting happens on the playground, when she tries to tell her preschooler not to do something that other kids are doing. How do you handle enforcing rules for your child when other parents have differing viewpoints?