I wouldn’t assist with any hatching until it’s been a bit from when they start.
Most babies will internal and external pip and then take a break that can last anywhere from a few hours to a whole day.
If you help them you risk exposing the other eggs to less humidity and temperature when you open the incubator and thus causing them to be stuck to the shell and die.
The only time I worry is if they’ve internally pipped and haven’t externally pipped in over 16 hours. Then I simply make a small external hole for them to breath through and let them continue on.
Also about the new baby, it will rest for nearly 24 hours until it is all fluffed up and rested. Then you can expect it to perk up.