A one-month-old kitten is still very vulnerable and needs special care. Here are some feeding suggestions:

Diet: You can feed them some cat-specific milk powder or kitten-specific cat food. Be sure to feed them small meals frequently and do not feed them human food.
Excretion: Kittens may not be able to use the litter box on their own yet. You can gently wipe the kitten's bottom with a damp cotton ball to stimulate it to excrete.
Keep them warm: Kittens have a relatively weak ability to regulate their body temperature, so be sure to provide them with a warm environment.
Safety: Kittens are curious and love to play, so it's important to ensure their living environment is safe and prevent them from coming into contact with dangerous items.
Interaction: Interact with the kitten more often, pet it, and play with it. This will help it grow up healthier and happier.