Honestly, I think a lot of mums don't realise it at first because it doesn't always look like crying all the time, it can be persistent anxiety, feeling completely detached from your baby, or just a heaviness that doesn't lift even after the newborn blur settles. From what I've gathered, the first few months are the most common window, especially when sleep deprivation is at its worst and you're still juggling everything on your own. What I've heard from a close friend who went through it is that she finally sought help when she noticed the feelings weren't passing after weeks, she saw a doctor who referred her to a counsellor, and that structured support made a real difference for her. It's also worth knowing that dads can experience PPD too, so if your partner seems off, that's worth paying attention to as well. That said, everyone's experience is different, so do check in with your own doctor or a mental health specialist who can give you proper guidance tailored to your situation.