I was exactly like yourself with my first born. I would triple pack everything and I mean everything so that I need not have to go searching to buy it at the stores. Going outdoors with my son was tiring so we tend to stay indoors most of the time. I get cranky very fast too and tired most of the time as I needed to work during the day.
By the time I had my second son, I took it real easy that I sometimes feel guilty for not giving him the attention he truly needed as compared to his older brother.
I think almlst all first time moms go through this phase: the overpreparing phase. Maybe you just learned the lesson and applied it to your second kid. I think we moms has the innate ability to distribute our love evenly to our kids. So don't worry momma. I know you're doing great. 😊