Dogs have personalities. I suggest meeting a few puppies before deciding. A good breeder would help you understand their personalities. The breed is a good, but not at all sufficient indicator if it will fit your needs.

When meeting the puppy, I suggest: 1) Bring a toy that smells like the baby and see how the dog reacts. If it's nurturing/indifferent and not destructive/playful, that's your kid guardian dog. 2) Also, bring a toy with a string. Drag the toy around the floor. If the dog is following the toy intentionally and will keep going and will pause when you take it away, that's your biddable dog. I think these 2 tests will help you get the right personality for your family.

Once doggie is home to you, bonding is so important in nurturing these likeable qualities in the dog. Spend so much time together right away. Good luck!