Another picture.

Brown Blades Down Low. AKA BBDL. :-)

So far, it seems the grass is healthy, but the grass is developing browner blades in the lower sections. This is not a disease. It's not a problem. It's totally natural as the grass grows in. Mine has it too, every late spring.

While this could be the sign of a very early fungal infection, I don't see any other signs of it at this moment. It's much simpler than that.

The grass looks too young to stand up fully just yet, but don't mow shorter. Longer mows will encourage slightly thinner grass right now, but longer roots on it. I'd accept the trade-off.

" planted grass this Spring "

Make sure to keep an eye on it, just like you're doing, as it's likely to need some extra care and watering this summer as things heat up. So far, you're doing really well but the harder periods are still coming...

Thank you! We mowed it once so far - 4” and won’t mow any lower. It’s been pretty warm so far so going to water to keep things moist!