any advice please

hello :)

I'm a single mom to a 33 months old boy and a 2 months old baby, my 2 years old is very jealous, he tells me every day that he doesn't love the baby to take the baby to another house, I try to give him attention but it's so hard because im breastfeeding the baby so it's very hard, im always trying to be next to him when he is playing. he tries to hurt the baby. and he just doesn't listen. I feel very bad for him but I just can't left the baby alone. please any advice. is this normal? has anyone been through this? I'm going crazy