They should be fine but if you are concerned you could add a heat lamp if you have that available. I used to put a crate with extra hay/bedding in it in case they wanted to snuggle in.
Our 6 wk old emu chick started acting off about 3-4 days ago. She just wasn’t holding her neck/head right. She was eating when I noticed her moving her move slow and drooling while trying to eat, we felt uncomfortable enough to take her to the ER vet where they informed us they had some...