Severide was this close to being a daddy once upon a time...
But alas, the writers and producers of Chicago Fire and P.D. have a serious dislike for children for some reason.
I get that working with child actors and infants comes with obvious restrictions, but those two shows take that to a ridiculous level. From memory alone we have on Fire: Casey getting the custody of the Darden boys, but only for a short time after which they move away, never to be seen again. Casey breaking up with both Hailey and Gabby over having children together. Shay wants to have a baby but it doesn’t work out. Gabby has a miscarriage + the warning of the doctor not to get pragnant again. Gabby and Casey lose their foster child. Mouch’s daughter gets painstakenly introduced for exactly one appearance.
On P.D.: Voight’s son Justin dies. Olinsky’s older daughter dies, the other gets completely cut from the plot. Burgess has a miscarriage and all the other characters are childless except for Antonio.
We can conclude two things from all of this: if your children are older teenagers then chances are high that they either die or disappear, except in the rare cases where they were introduced as young children like Eva and Diego Dawson and the Herrmanns. But this plot armour only works for children after they get born, the survival rate for pregnancies is extremely low and only Boden’s son managed to be born alive.
How does Chicago Med handle the survival of their children?