I don't agree all eating/sleeping is luck. A huge deal (talking NT children here) has to do with how it is dealt with. Many will be telling people " we have tried everything we have done all the stuff they say too but nothing works"
One example was a parent at primary who had " tried everything " to make her child not cry when going to school. She would enter school with her child going
" come on Jane today you will not cry"
"oh come on Jane it makes me sad when you cry"
"Jane today it will be just fine you just need to trust me"
"Jane you dont need to cry today ohh come on jane ohh sweetie its not so bad I will come back to get you"
"Jane your a big girl you can go to school without crying"
Basically Jane (obviously made up name) got SO much attention from crying she continued. Additionally mum was so anxious about her crying Jane picked up on this anxiety that it became even more anxious setting for her to go to school.
With food I have seen similar
"Dave eat that please"
"Dave just one bite"
"Dave come on etc etc"
A lot of it is how we parent. The poster who above said " it has taken a lot more parenting to get a half presentable child" of one of their children has it spot on.
Some children need more effort in this than others.
Those who says " no matter how often I tell my child no they ignore" IT may feel that way but eventually as they grow this will sink in and it will help create who they become.
Also there is a huge difference in the parent who sits on their bum with a cup of tea and go " No John dont do that... John I said no Dont touch"
And the parent who gets up and moves their child from what they are not to touch saying " No Poppy dont do that here have a look at this book"
Both parents have said no however 2 very different ways of saying no.
So parent of John might say " no matter how often I say no John just keeps doing it."
Where as Parent of Poppy might say " I tell her no and she goes to do something else"
The message Poppy gets is " I can't touch that but ohh look something else" The message John gets is "Nothing happens if I continue" Eventually as the children grows up this will spill into other things.
It is about nature vs nurture yes. However it is also about how we react with our parenting.
I have 4 teenagers who eat a wide range of food. I am often told that I am " so lucky" Number 4 is now the one with the widest range of food. However as a toddler/early primary school" she was awful with food. I read loads of books tried different techniques and frankly at the time I would have said " nothing works" Then I found a very hands off approach. Simple straight forward listen to your child and what they dont like. Acknowledge this and then add a few things additional and a simple " dont forget to eat your peas" then attention off the child. back to conversation.. And for her it worked brilliant..Also helped that once I started listening I learnt she (like her mother) dislikes gravy.. Doesn't like tomatoes.. So once those 2 things were cut off her food she was more open to trying new things. However that took about 4-5 years to work out and they were difficult years. A lot more parenting than her older siblings (who eats anything and always have) needed in this area..
She is also a introvert and the rest of her family is extroverts so there again I have needed to adjust my parenting for HER needs. Frankly it has been hard at times. No I have not got it all right but her dad and I try our best.
IMO A lot of it has to do with what we expect and how we put this across. Not just about how we think we parent. each child will need slightly different parenting. IMO that is a good thing. it means we as parents adapt to our individual childrens needs. What works for one might not for another. I think it is good parenting when we continue to work towards finding out what works for " that child"