Babies are hard to read. And by "hard" I mean pretty near impossible sometimes. It's easy to tell what makes your baby happy, but when they're less than happy, figuring out the cause can be tricky. There are several ways your baby may be trying to tell you they're frustrated, but figuring out the cause behind it might be harder than you think.
As Baby Center noted, babies don't throw tantrums until they're around 12 to 18 months old. That being said, their frustrations can start a lot sooner. Even a newborn may feel frustrated when they're trying to communicate that they're hungry or overly tired. Older babies can get frustrated when they're unable to communicate what they want, or when they're unable to get to an object they desire.
Your baby may have an otherwise happy and calm temperament, and suddenly have a very out-of-character bout of crying. If they're healthy, fed, and clean, chances are they may just be frustrated about something they're unable to achieve. We all have days when we are "touchier" than usual, why shouldn't babies? Check into a few of these signs before assuming your baby is anything but frustrated, and then teach them the steps needed to overcome it.