This didn't bother you too much, although at times it does make you a bit wary of the dog. However, things have changed recently with the arrival of a new baby. You aren't so much concerned for the present time as you are about what happens when the baby starts to crawl and then play with the dog. It leaves you with an uneasy feeling in the pit of your stomach.
Fortunately, you are facing up to the situation now and have plenty of time to take things in hand.
In an ideal world, prevention is better than cure and by teaching a puppy to have a soft mouth future problems can be avoided. However, if you have missed this opportunity, even adult dogs can often be rehabilitated with some patience and know-how.
For those dogs that are aggressive or you feel out of your depth with, always seek professional help. Your vet can put you in touch with a certified animal behaviorist who can look at all the relevant factors to put a strategy in place to keep everyone safe.
To do this you need basic equipment and motivators such as: