Tough love works, but you have to keep control of your own emotions in the process. Babies are fast learners, and as soon as they realize that dad is a caregiver just like mom, they will accept being in his company. Try a more subtle approach first and only try tough love if you really have to. It can be a traumatic experience for your little one that may play out later in life. Chat to your pediatrician about tough love and understand how it might impact your little one.