It's normal for the crop to be full at night, then be empty in the morning after they have been sleeping. A young bird may scratch a little especially when feathering in, but it may be a good idea to look for bugs like lice or mites.
Hi @Eva_hatchings do you have a thread of your own, I can't find it.
Can you please give more info and some photos?
You mention swelling on the right side below the "next" I assume you mean "neck"?
Could it be your chick's crop that you are feeling?