How to know if my baby had Covid

So back in March we visited my partners grandparents, they only told us once we were in the house that they’d been unwell with a cough 😳 they didn’t touch baby

2 weeks later, my baby had a bad cough and a temp for a few days. I genuinely felt so worried at the time it could be Covid. Me and my partner were fine though which gives me doubts. She’s EBF if that makes any difference.

Now it’s come to light that the grandparents we visited have had antibody tests done and tested positive for having Covid at some point

What do you reckon the chances are they had it and passed it to my baby? I’ve been so worried about taking my baby out in public but if she’s already had it I might be more inclined to get back to normal?