Butternut squash

Question

Plant raised and kept indoors are starting to turn yellow and die, why?

Answer 1

Your seedlings may not have had enough sunlight.
Another cause of yellowing leaves is watering issues; either too much or too little.
Here are some links with more information.

https://www.gardeningknowhow.com/garden-how-to/seeds/seedlings-turning-yellow.htm
https://www.gardeningknowhow.com/garden-how-to/seeds/seedlings-after-germination.htm
https://www.gardeningknowhow.com/edible/vegetables/squash/growing-butternut-squash.htm
https://www.gardeningknowhow.com/garden-how-to/seeds/how-to-harden-off-your-seedlings.htm