Delta flight Dublin to Atlanta with baby

Seat layouts vary. If you look at the seat map for your flight on delta.com you'll be able to see the exact layout currently planned for your flights. You are looking for bulkhead seats in "main cabin" (not "comfort+", unless you have paid extra for that). For Dublin Atlanta it is most likely to be seats 35D, 35E, 35F only. These seats will usually shown as "unavailable" online, so you need to request them by phoning Delta.

You'll probably pay an extra fee to book on the phone, but that way you would probably be able to confirm if you can get that seat before you pay