Re: Any new evidence??
It's a hotly contested recommendation, with good data to support both positions. Basically, it's one of those things where the recommendation is going to change back and forth based on whatever paper has come out most recently. You know your baby best- do you feel that he's ready for solids? Is he interersted in them? Does he watch you eat, make mouthing movements, try to grab your food?
One thing you might want to consider, whether or not you choose to start solids at 4 months, is baby vitamins. Babies who are premature are more likely than full-term babies to be deficient in iron. A lot of the rationale for starting solids at 4 months is due to the iron needs of premature babies.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"