I need help with discipline

I realize I don’t know how to discipline my toddler. My parents always spanked and yelled and that was how they disciplined regardless of how bad my actions were. I usually tell my son no or stop and let him sort out his feelings. But he has this thing where he jumps behind me when I’m sitting down and kicks me. Or he jumps in general and is bumping into me and causing physical pain. I have a 5 week old who nurses a lot so I have to be carrying her. This has become a problem because it’s not me I’m trying to protect as annoying as his jumping and bumping is, it’s my baby. Today my toddler has hit the baby in the head twice. The first time he bumped his head against hers. Not on purpose of course but he jumps and bumps into anything and it happened in a matter or seconds right in front of me. I was so angry but I walked away, I don’t know how to tell him or explain to him what he did was wrong. So I left to the other room and he followed me and did it again but this time with his foot! Once again I was there mostly trying to ignore him asking him to stop. I realize that I don’t know how to discipline at this point my parents would’ve beaten the bejeezus out of me. Obviously I don’t think that’s the solution and it’s not what I want to do, but it’s how I was disciplined so I realize that I don’t know another or better method. how do you handle this? How do I make him understand that 1. He needs to respect my personal space without making him feel rejected by me and allowing him to be a kid. 2. Be more gentle around baby. via /r/Parenting https://ift.tt/3kAlmEW