Why are some babies so easy to please and simple?

My friend's 8 month-old baby girl eats practically everything given to her. It's even a miracle she likes green beans, what many other babies hate. She doesn't cry too much and if she does, it's usually when she's hungry, needs a diaper change or needs to sleep. There was only one rare time she wouldn't stop crying because of gasses hurting her but that got solved. I know because I've once stayed over for an entire day and the house was peaceful.

Otherwise the baby lets herself get carried by others in reunions, is smiley and easy to pleased. What's the trick of getting a baby that isn't that fuzzy and isn't a picky eater, an easy baby? Why are some babies easy little humans? She's the dream baby anyone would wish to have, so simple.

Why are some babies so easy to please and simple?
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