PP
Also called pp, weeks PP, months PP, newly PP, PP hormones
PP stands for postpartum, the time after giving birth, and parents add it to say how far along they are, as in 6 weeks PP. On parenting forums the same letters can also mean previous poster, pointing back at someone who replied earlier.
How it's said
I'm 7 weeks PP and also have a 19 month old.
Again, PP hormones are awful.
...not only did she not see the hard parts of my PP journey because she wasn't there...
Who says it
Where it came from
Postpartum came into English in 1844 from Latin post, after, and partum, giving birth. Wiktionary notes that postpartum describes the mother, while postnatal can mean the same thing or refer to the baby.
Medical abbreviation lists give PP for postpartum, and also for postprandial, after a meal, and pulse pressure. Guides to parenting forum shorthand list a separate meaning, PP for previous poster.