my seedlings stems are starting to go red

two of my 4 seedlings are starting to get red stems one noticably darker than the other yet the other two are still green all the same strain has anyone come accross this before? first crack at growing and dont wanna lose half the crop to something that could easily have been avoided

could be genetics, cold temperature ( water , ambient air, soil), as long as your babies leaves are still nice and green you will be ok. dont over water. and when watering; water closer to the edge of the pot and not directly at the stem. dont want to start getting the main stem rotten.

have fun

i was thinking that it could also be because of breeding of the plants the different genetics coming thru differntly, they are outdoors so we will see how mother nature looks after her babies haha, thank you for the help