Our usual sleeping arrangements at home with the babe are baby co-sleeping in mom & dad's bed. Now that she can roll she chooses to sleep on her front (usually not touching/snuggling with anyone). When it was colder, we all wore extra layers to sleep, and kept the blankets down low for safety, so they only covered half our bodies.
I'm having trouble envisioning how to do this in a tent -- it often gets quite cold at night here in upstate NY, even in July/August. Last summer to be comfortable while we slept, we bundled up in many layers and hats, AND had our sleeping bags pulled up to our chins (or even over our heads in some cases).
From reading other threads on this subject, I can see that it makes more sense to make a firm surface out of layers of comforters/blankets (rather than air mattresses), and use blankets on top (rather than each person zipped in a sleeping bag). But it gets way colder in a tent than in our bedroom. I'm worried about the safety of having the blankets pulled up near the baby's head. Also, it seems like the surface we're sleeping on would inevitably get scrunched -- all the issues with blankets and such that we try to avoid to keep co-sleeping safe, especially for a baby who sleeps on her front. Or at 7 months, is she old enough not to worry about this stuff so much anymore?
When we took ds camping for the first time he was 5 mo old and it was pretty cold (we live in Canada). We bundled him up in a snow suit and he slept great.
When we took dd camping, she was 8 mo old and could roll and move so we didn't worry about blankets being near her head.
I slept in the same sleeping bag with them when they were babies. It was easier for nursing.
But get the cheap-but-effective insulating pads. I got the one inch thick stuff, and spent $8 on three of them, almost enough to cover our whole tent floor (it's a two person tent).
The insulation underneath to have a firmer sleeping surface sounds like a really great idea. (There was this time we were camping, and it rained at night, plus our air mattress was dead, and you could feel the freezing rain running underneath our tent all night **shiver**. Would have totally solved that problem.)
Using one of those cheap in-bed co-sleepers (or a large enough cardboard box) might be another option a 7 m/o is small enough for to have in-bed and help keep space around the baby.
Bundled up enough but on top of your sleeping bags/bed (in one of those baby sleeping bags) might also work.
We have used those foam fold up pads (they fold up 3 ways) for car camping and work way better than the plastic blow up ones. We've just collected a few over the years from various places. But I did see them for sale at Costco here in California the other day.
We took our 7 month old camping in Death Valley in April, sorry can't help with the cold it was so hot at night then. But did do camper camping (no heat) sleeping a few times over this winter. I just bundled him up with hat, cozy top, even socks on his hands for sleeping at night. I did have a blanket over him and another over him and I. My husband had his own blanket. I kept waking up all through out the night checking and he seemed toasty and happy. His nose did get a bit chilly, and I did get chilly nursing him during the night because I moved up and out of the blankets, but wearing a zipper sweatshirt with a hood helped that.
This article is kind of fun and inspiring for camping with babies,
I just love being a mama to my son born 9/22/2011 and expecting baby early December 2014
I put babe in pajamas and a fleece suit (youngest was 9mos) and shared a sleeping bag for night nursing. Babe slept great. I hardly slept at all with the constant checking on dd/ds to make sure the sleeping bag wasn't around their face, and b/c it was cold not being able to pull the sleeping bag around my neck. It was well worth it though for some great trips!
Mama to dd 03/07 and ds 12/09