She's revealed some details on exactly how much effort she took in her blog entry a couple of days ago:
小松彩夏『産後1ヶ月経ちました✨』
^ She had to endure labor pains for 60 hours, take 42 hours to deliver, & lose 2,000ml of blood!

It's been a month now & she's recovered well.
I guess she wouldn't wanna have a 2nd baby in the future like Keiko & Chieko (who's already had her 3rd child earlier). lol