I hope you get to bring your baby into the cabin, but please make sure the other passengers are aware of this. The only time my ex (a surgeon) had to give emergency medical assistance on a plane involved a passenger who developed severe breathing problems/chest pains. Fortunately, it was only an asthma attack... but it was brought on because someone had a cat carrier near the guy, and he had a severe allergic reaction. Dogs don't seem to elicit as many reactions as cats do, but it would be polite to warn people nearby if they have allergies.