James Biddle said:
In fact, some manufacturer state that they have incorporated holes in the mattress sides for interior ventilation.
Some? They ALL do that. It's standard sales talk. And they do incorporate ventilation holes because it is important. You see, the average human sweats 1/2 liter (1.25 pints) per night. That moisture goes into the mattress, and then has to get out of it again.
But it is not enough to put ventilation holes solely in the mattress. Once the moisture leaves the mattress it also has to leave the bed. But if you use a solid base it can't leave the bed and will slip into the mattress again.
1 -
http://www.childrensbedcentres.co.uk/storage-beds/2-drawer-high-storage-bed-1
"Bed consists of a solid bed base (with ventilation holes), two cupboards and two drawers on runners for storage under the bed."
2 -
http://www.gltc.co.uk/fcp/product/-/gltc_exclusives/Fire-Engine-Toddler-Bed/2217
"Please note: This bed has a solid base with ventilation holes."
3 -
https://www.perweek.co.nz/flora-girls-bunk-bed/
"All cilek bunks are unique in their design, featuring, solid bases with ventilation holes (this makes the bunk more stable and makes it healthier for the child on the bottom),"
4 -
http://cgi.ebay.com.au/Pink-Fairytale-Princess-4-Poster-Toddler-%2F-Child-Bed_W0QQitemZ250406819817QQcmdZViewItemQQimsxZ20090415?IMSfp=TL090415125001r15850
"This bed has a solid base with ventilation holes."
5 -
http://www.victorsteel.com/category.asp?cat=Hospital%20Beds
"Mattress base: 1.2mm steel sheet with ventilation holes."
6 -
http://www.ilcaustralia.org/home/search4.asp?state=NSW&page=1&MC=21&MinC=9
"BED CONSTRUCTION
Base and frame
The bed may have a steel or wooden construction. The base may be wooden slats, wooden with ventilation holes, weld mesh or sheet steel with air holes."
7 -
http://erniesplace.com/_BoatingDiaries/090100_Jan/Diaries/090116_Banbury_South2.shtm
"Bed linen wash day on Ten Bob Note!! While the bed was stripped I decided to check out the inside of the base for dampness as last winter there were problems with condensation. Was very pleased to find no evidence of any dampness at all. After the problems last year, I added a considerable amount of additional ventilation to the bed base to increase air flow, it has obviously helped."
8 -
http://www.stopsidsnow.com/FAQsAboutMattressWrapping.html
"My crib has a solid base and the ventilation holes on the
underside of the BabeSafe cover are obstructed. Do I need to do anything about this?
Yes."
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Really, there's so much about ventilation holes in beds out there on the net.
If you don't believe me, or anybody else here, go to a local bed dealer. Ask them what they think about it.
But seriously, I pity your niece if she doesn't get proper ventilation. If she doesn't, it doesn't matter how nice the bed looks (it does), but she will still have a problem.