Learning to understand your newborn's cues is similar to learning a second language, except with a lot more pressure and exhaustion. It's normal to stress about not knowing what your baby wants or not understanding their cues. Luckily, although it isn't always intuitive or easy to understand, babies do have a language of their own that they use to communicate with us. Learning to interpret the signs that your baby is angry, hungry, tired, in pain, or any other emotion might seem like a daunting task. As time goes on, however, you'll learn about your baby's personality and their unique emotional cues will seem natural and straightforward. Most of the time, anyway.
Anger is one emotion that many parents have a hard time decoding in their babies. But, just like adults and children, babies experience every emotion on the spectrum, anger and frustration included. These signs are fairly universal symptoms of frustration and even though it might be hard to picture your newborn bundle of joy in a rage, it will most likely happen at some point. What To Expect noted that true temper tantrums don't usually start until your baby is well into their second year, but younger babies can certainly get angry.
Knowing the signs of an angry baby before the fit of anger happens can save you a lot of confusion in the long run.