It's pretty early for solids (the fact that you 'can' start at 4 months doesn't mean that you have to, or that it will benefit baby.) Current recommendations are to start at around 6 months unless baby CLEARLY needs something sooner -- and definitely never before 4 months. If you have definitely decided to start, it doesn't matter what you start with, or what order you give them in. You don't have to start with rice cereal.
(It's nutritionally empty, tastes like cardboard, is very constipating, and is no more digestable than any other stage one food.) So, if you want to give veggies, start with veggies. Green, orange, purple ... whatever. Or fruit.
Or other cereals. Many doctors will have their own idea on the 'right' order, but every 'right' order is different, meaning that it doesnt' really matter. What DOES matter is that you start very slowly.
His milk is 100% of his nutrition. Any solids are purely for fun, and you don't want to replace his milk (a complete food with lots of fat ... more.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.