u/Physical-Ad803

I have two chinchillas, one almost 8 months old and the other turning 4 months old tomorrow. I'd like to know if anyone has experienced this before and if it's normal, Because when I adopted the little one, who arrived almost a month after the big one, and they have been sharing the environment for almost a month and a half, but for the last 5 days the little one has been different, I took him to the vet, and during the examination, he said everything seemed normal. He checked his teeth, etc. He makes this noise sometimes, and sometimes he wakes up making other kinds of noises, then I speak softly to him near his cage and he goes back to sleep, the big one sleeps in another cage