Learning new things is always difficult.
When we learn to walk or ride a bike, we try, we fall, maybe we scrape our knee and then we get up and try again. By the time we get older, it is understood that learning new things is hard but when the world is so new and everything you do is a learning experience learning can be exhausting.
Rafaella, as her doctor says, is very mature for her age. Sometimes I expect her to tell me that she's going to the mall with her friends and that by the way, she's taking the car. What?! At 4 months the doctor has put her on cereal and so the next phase of learning - learning how to eat with a spoon, begins...
As they say here in Dominican Republic, Buen Provecho!