Formula question

Is it selfish to stop breast feeding and switching to formula for 1 month old ! I want to alternate breast feeding and formula feeding durin the day and breast feed at night ?? Any mums doing that ..??

Just to get some piece of mind..! I feel like I m losing my mind and not being able to do anything else apart from just feed and diaper changes and feed again !!

My 5 year old feels left out and neglected ! She has not been very close with her dad and now he is tryin to help With her as much as possible but she still wants her mummy !! Being a mum is so difficult :-)