My 4 month old daughter is different

My son slept the whole night without drinking milk when he was 2-3 months old and my daughter is still waking up every 2-3 hours in the night for milk its sooo annoying!!! Shes gunna be 5 months so why is she doing this to me? I been restless no sleep at all . I need help from my mom I thought she would eat less by now … because my son ate lesss this months … what does this mean..