The other is a little more niche, but I’m a runner/endurance sports and my Balega socks have been incredible. They are $14 a pair (yes, $7 a sock), but they are easily worth every single penny. I’ve done 30 hour hiking/running events and my feet were the only thing still dry on my body thanks to those guys.
Don’t sit, walk! Good for her and helps move things along (but if you already have a kiddo you probably know that). Good luck with the baby.