Congrats! on the first mission.
Are you rotor or fixed and what kind of transport times do you guys have? Flying a month old (hopefully, term) with a (presumed) intestinal (?) obstruction can make air transport an interesting transport choice. Any airway considerations? The little ones can be pretty sick, so...
If I had a controlled airway (or needed to) I'd place an OG - but, the transport fairies rarely bless us (and these blessed patients) with easy choices.
No real secret for NG placement in wee ones - lots of risks in these populations though.
Lots of help, small flexible NG tube, analgesia/lubricant and a confirmation x-ray when placed as a standard for NG (you can check pH - but, why are we transporting and other considerations may demand the confirmation x-ray).