2 under 2

I’m currently pregnant with a baby boy, due in March 2024. I also have a 16 month toddler any advice on how to give both attention without putting my toddler to the side? Ik a new born needs lots of attention but yet so does my toddler. I’m afraid of him feeling jealousy and showing any aggression towards the new baby because he’s recently started hitting when he gets mad..