Hello everyone! The girl is pregnant with her second child, the baby i…

Hello everyone! The girl is pregnant with her second child, the baby is only one year old. I want to ask what can replace nighttime feedings while he's still breastfeeding, the doctor said it's not allowed to feed him and I don't know what to give him - formula or can I give him regular milk? He has never had formula before, could someone who has been in this situation help?