Take car seat to check in, they’ll tag it & you drop it off to the oversized baggage check in. Get it back with your cases. Maxi cosi pebble is fine, obv without the isofix base & attach with a seatbelt in the cab. We just took our pebble to Canada no problems!
Do an online order to boots in the departures terminal for any nappies/wipes/toiletries if you’re only taking hand luggage or are strapped for space in the suitcase. Anything you order just goes on the plane with you as duty free then.
If using bottles, Milton cold water steriliser tabs and a big tupperwear to sterilise in your hotel room. Small washing up liquid & bottle brush to clean your bottles. I’m BF dd2 and still like to take Milton for any toys/dummies etc.
If formula fed take a few ready made bottles for the flight, much easier. Can take liquids through the airport for baby.
Use family check in lines at security etc. Don’t board the plane early (it’s offered as a benefit for families but in my experience, it’s not beneficial to be on there longer)
Take a sling. Lots of airlines don’t let even cabin approved travel prams on board now as loads of people have them so it’s a lot of overhead space taken up. Due to this I don’t think it’s worth buying a travel pram if you haven’t already got one. Plus the big pram baskets are a godsend for lugging everything around to the pools/beach.
Mini pram fan for while you’re there to keep baby comfortable in the heat.
Take loads of snacks. Both for the plane and while you’re there, although depends on how close to 6m your baby is as to whether they’re weaned/weaning.
Just in case, take a couple of calpol sachets in the change bag (obv in your suitcase too for the trip).
Mainly, don’t stress. We have flown a lot with our DD’s (3 and 9m) and have only ever had people be super friendly and engaging with them.