I always call to have them note infant in arms on the record in advance. IIRC there can only be 1 infant per row so that will avoid potential reseating due to the location of other infants. And yes, no exit rows or rows immediately in front of or behind the exits.

Also if you are on a CRJ at least some of them only have the extra oxygen mask on the right side of the airplane so you'll need a C/D seat.

AS won't allow bulkhead rows for infants anymore since ONE of their new airplanes has airbags (I kid you not) for that row. I'm no nwa fanboy but nwa.com let you notate it online. It'd be nice for DL to add that functionality so I don't have to talk to one of their agents.