Its been about 11 years since I was on Oriana with my then 6month old baby. Back then (dont know if this is still the case) I was able to preorder baby food/formula milk and juices to babies preference. I was alllocated a cupboard in the main dining room where I could take the daily requirements. I cant remember the age at which you can leave them in the Kids club but I think it must be either 2 or 3 years old. But we were allowed in the playroom which had a ball pool and kids toys and provided we stayed to supervise younger children were well catered for. There is a paddling pool with plenty of outdoor playthings. The night nursery was fantastic - I was even given a private room to breast feed. You havent stated the ages of your children but I guess they are both under 2? You will either have been allocated a cot (again you havent stated ages) or bed guards. If you do have a cot you can ask the cabin steward to remove the little curved sofa out. Take a little plastic circular peg drying thing - like you use in caravans for the little bits and pieces as the little line in the shower is never enough for the kids things to dry out. Make good use of the night nursery and I am sure you will have a fab time.
Oh thank you so much for your answer! Really good information and some great tips. Thank you.