high needs toddler baby otw

just found out I'm pregnant, it was a surprise. Excited and scared. My son is 15 months and a lot of work. He was a very needy infant and that's just who he is he knows what he likes and doesn't and feels it intensely. I'm just needing reassurance I suppose. How do people do it!!? I know people make it work I just feel so scared of not being enough for both babies. I can't possibly hold them both and give them what they need at the same time.