They will probably have you down on your reservation as 3 adults and 1 child and 2 infants with those ages. They should automatically give you a room with a daybed but it doesn't hurt to put it on your reservation as a request. Since you booked a standard view room and are overloaded with people, I would highly suggest requesting 1606, 2606, 3606 or 3606. The view is okay but the main thing is that those four rooms are oversized. Please remember, requests are only requests. There is no guarantee you are going to get what you request. However, if one of those rooms are open when you check-in, our room assignors try really hard to meet your requests. Just make sure those rooms are listed on your reservation!
Also, when you check-in, don't do an on-line check-in. Then when you get to the front desk and do a regular check-in, you can ask if you got a daybed and if you got one of the rooms you requested. If you didn't get one of those four rooms (because they are occupied), then at least you can have the front desk person verify you have a daybed. If you don't have a daybed, just nicely tell them you NEED one and to please change your room.