I didn't want to let the person down so I completed my standard answer: Parker Sonnet in any flavour and colour you like, it is of classical style and dimensions, and will most likely never go out of fashion as such. Yes, Sonnet has its issues in QC and elsewhere, it is a controversial pen. But when it works, it works flawlessly. And it has a wide range of colour and finish options, too. It will take several years, maybe a decade before the aforementioned baby will start using the gift. At least they should make sure that the pen writes well before making the purchase.
What do you guys think about a pen as a baptism gift... I am not sure what to think about giving a precious writing instrument (of any kind) to a recipient whose hand will continue to develop and grow for many years and preferences will most likely change in the meantime. The original poster also wants to have the gift pen engraved...