Yeah, 10 is probably not enough for full time cloth, especially for a newborn. 20 is better but still might be close if you're going through 8-10 diapers a day during the early months and want to wash every 2 days. Don't forget that you'll need at least a few clean diapers to use while the dirty ones are washing/drying. Not sure how much rain you can expect in Cuba or if drying indoors will be an option in case of rain, but that's something to keep in mind... Not to mention any times when you may just be very tired or overwhelmed and it takes you longer to get around to hanging your diapers up to dry...

Of course you could just get 20, wash 1 to 1 1/2 days at first and then you can gradually stretch that out as baby gets older and starts going through less diapers. Or maybe supplement your ME stash with some quick drying prefolds or flats. Just a few to tide you over should your MEs not be dry yet...

Also think about getting a few liners for nighttime. Normally I'd say don't worry about that for now, but since you have to plan ahead for the first year then it's worth thinking about now. For the first while the baby will poop often enough that  he/she will be getting changed often that absorbancy won't be a concern. But when the baby is a bit older and has stopped pooping at night then you can start putting more absorbancy into the nighttime diaper in order to not have to change at night.

One tip if you ever do have to use poor quality disposables is to use them in conjunction with your covers (or maybe even your diapers). Putting a cloth diaper cover over top of a disposable can help stop poopy diaper blowouts (the elastic even on good quality disposables just isn't enough a lot of the time).

Karen.