I think it's been a while since your post but I found it on my own search for information on partial trisomy 3p, my 4 year old daughter has this along with partial monosomy 9p. She is doing fairly well, she is developmentally delayed, she rolled over at 9 months, walked at 2.5 and started running at 4. She is not speaking more than imitating words and sounds and her words aren't clear. We took a class at the institutes for the achievement of human potential in Philadelphia last summer whic was really encouraging, they have helped many delayed kids with a simple yet time consuming program- we don't do it perfectly but we do think it has offered some improvement, especially in her vision, her eyes weren't tracking together but now they are together most of the time! The book to read before the class is called "what to do about your brain injured child". Don't be offended by the title, that's the term they use for any delay, it is all in the brain. Please update us on your little one that you were asking about so we can learn more from you!