Don’t 10 week old babies have to be fed like, every couple of hours? So leaving him alone for 8 hours, he might have missed, what? 4 feedings?

https://www.hibobbie.com/blogs/bobbieu/baby-feeding-schedule?_ab=0&_fd=0&_sc=1

“many pediatricians recommend feeding at least every three hours during the day and night until the baby reaches their birth weight again. This typically translates to feeding your baby at least eight times a day, and likely more, throughout every 24 hours of your baby’s first week(s).”