I`m fairly new to growing also, your picture is very blinding so it's hard to see, personally i'd check if:

What kind of light are you using? Is your light too close? If it's a big light it might be to hot, put your hand where your plant is and see if the feeling of the light is uncomfortable.
Are you giving nutes? Make sure not to give too much! 1/4 Strength is plenty at first.
When you water, make sure water comes out the bottom and don't water it for a few days until the soil starts getting dry, although your leaves don't seem to be drooping it could be overwatering anyways.
I water my newly potted clones once every 2-4 days.

I don't know if leaving them outside for a few days then back inside can affect them, I've heard it's not a good idea but like I said, I'm not an expert quite yet! Hope this helps a bit!