I had my first litter last week. I managed to remove piglets at intervals from mom to avoid crushing for 4 days then day 5 during the day I had let them outdoors with her and wasn't paying attention for 15 min and she killed one. You couldn't hear the screaming bc she was completely on top of it.
So I went back to hard-core monitoring and removing of piglets.
That first week they have to eat every hour (sometimes they eat every 20 minutes. So I got up to let them out every hour and 15 through the night and spent long periods of time with them during the day. I found that when my sow is tired after dark she let's them nurse better. So from 7/8pm until 10pm I often stay in the pen with them so they can eat nonstop. We also have a farrowing crate we made with pallets that is extremely important. And a big bin with heat lamps that I can keep them in if I don't want to monitor them in person (or continually on camera).
Granted this is a huge time investment but it is what works for me. Additionally, next time I would choose to breed for summer births bc winter makes the care much harder.