Hello everyone!

I have a friend who recently took her firstborn home!

One of her two adopted and neutered dogs has become overprotective over the baby. He growls at anyone BUT the parents when and if they comer to the baby. Including the other adopted dog. The only ones he allows to come close to the baby are the parents. 

Nothing really violent has occured  yet but the growling does sound menacing. 

Is there any suggestion on how to take action over this situation before someone gets hurt? What can she do? 

Thanks everyone!

*come closer to the baby. 

Sorry didn't proofread.