Aside from growth spurt, I suspect that my baby's probably teething, hence, his crankiness the last few days. How can I really tell that it's teething? What are the usual signs?

one of the most easy to spot sign to see that your baby is teething is if he is always trying to chew on something. if he can't find anything, he will try to chew on his fingers, and also produce a lot of drool. also, the crankiness and loss of appetite are additional signs of teething