We needed to know because, when we brought our twins home from the hospital, the smallest was under 5 lbs. It was incredibly important for/to us to understand,

We needed to know because, when we brought our twins home from the hospital, the smallest was under 5 lbs. It was incredibly important for/to us to understand, as accurately as we could how much was going in and how much was coming out from both of them because of how small they were. We probably could've stopped after 4-6 months but we kept it up, my wife liked knowing. We maintain a similar spreadsheet today for our infant but I suspect we'll stop around 6 months with this one.