The phrase "year postpartum" refers to the period of time that follows the birth of a baby and lasts for one year. It is a way to describe the time after giving birth. Full definition
You'll be spending a lot of time breastfeeding your baby during that first year postpartum, but finding the right nursing top will give you the confidence to breastfeed with ease. (tinyfry.com)
Participants who are one or more years postpartum are absolutely welcome to join! (rachelrichardsphysio.com)
The above picture is at about one and half years postpartum after my first child (Ava). (andeelayne.com)