Now some may grumble at Southwest's boarding policy for families with small children - if you have small children, you don't get priority and don't get to board first. Apparently there was too much complaint from Southwest's frequent fliers. So the policy is that families with children under 4 board between boarding groups A and B. If you're assigned boarding group A, then of course you board the plane during your assigned time. If you're in boarding group B or lower, then you would board between groups A and B. Because I'm the anal-retentive paranoid person that I am, I'm always afraid that if I board between groups A and B I won't be able to get a seat next to the window for privacy during nursing. So I always make sure to set my alarm for 24 hours before flight time so I can be assigned the first boarding group.
Something to remember: if you're not purchasing a seat for your baby and he'll be a lap child, remember to bring a copy of his birth certificate. I know it may be obvious that the child is under 2 years of age, but the check-in people may request to see a birth certificate anyway. I've read horror stories about parents who have had to buy a last-minute seat for their baby because they didn't bring the birth certificate. You can find more information about Southwest's baby on board policy here.
I never had to make use of the changing table on board the plane, but the flight attendants informed me that the lavatory at the front of the plane has a changing table. And I also asked them if they had any recommendations on the best place to sit with the baby. Responses varied, ranging from "near the front bathroom" to "in the middle near the engine" so the vibration might lull the baby to sleep. So I haven't heard any consensus on the best place to sit if you have a baby with you on board. If you have any advice otherwise, please comment!
But seriously, if RyanAir implements that rubbish about charging for toilet use, that would make them a seriously baby-unfriendly airline.