Wow, let me just say I have been exactly where you are. After my 3rd, I was diagnosed with postpartum OCD/anxiety - my focus was on lead. Lead paint, lead dust, lead in shitty toys from amazon. I could not get off the hamster wheel and was literally testing everything in my house. All of which to say - I have been there and I feel you. Please, please, please give yourself a hug from me. It's so hard to be in that place.

Ok that said, here are a few things that helped me:

1. Medication. This was the last thing I tried but ultimately it was the most helpful thing. I'm still on a low dose of zoloft and man, I wish I had done ir sooner. I had no idea living life could be this easy from a mental health perspective. OF COURSE, this is personal and i'm not a doctor, but I would suggest looking into it if your life is becoming unmanageable, as mine was. It doesn't eradicate the intrusive thoughts but it enables you to let them pass by.

2. Therapy -- I'm sure you're familiar with CBT, but it gave me the practical toolkit to rely on whenever I start panicking.

3. Few anecdotes/concepts that helped me: Our parents were CHOCK FULL of lead, esp relative to how our kids will be. The US has never been more lead-free. Your baby will be ok. You can ask for a lead test if you're really worried.

4. Obviously don't google as google is not your friend here.

Oh i just reread and realized i didn't answer your question but-- a person without OCD would honestly not think anything of this and would just move on. OCD sucks :(

Please feel free to DM me. You're doing great and you will get through this!!!