The reason the weight and height of the baby is so important that they are measured immediately after birth, is because the father needs to send the text message to everyone he knows "(name) was born at (time), weighing (amount) grams and at a height of (amount) cm. Mom and child are both well."
We're looking forward to all these important numbers in obituaries. "Grandpa died today at 18:23:21, weighing 78 kg and with a height of 182 cm. He lost 42 grams of soul at the moment of death, but gained an entire 75 kg since birth, an average of 972 grams per year."