Nope - those rooms are NOT smaller. 8186 is a beautifully nice Cat 5E; you are thinking of the 4E rooms on deck 5 have smaller rooms with large verandas. We adore those aft rooms - those verandas are huge.
A note about the verandah & your 3 year old. The way the aft rooms are constructed, the railing is curved inward. I'll bet your child can stand under it even (our 5 year old can). I think they would be a better bet than a regular verandah. Check out pics of 9674 here, which similarly to what 8186 would resemble.
http://www.disboards.com/showpost.php?p=45590103&postcount=137
Also, I don't know where that seasick stuff comes from - I think the ships motion is similar all over......if he's going to get sick, he's going to get sick (and I hope he doesn't!!!).
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