Find out ahead of time what the process in place for first aid and lost children is and in the case of lost kids, consider precautions for identification and/or locating. Some festivals will issue paper wristbands that have the parent's number (avoid including your child's name) on them and these are a really good idea , however bear in mind that over several days the standard issue paper ones will probably wear down. Some more robust alternative ideas are:
10. Essential Kit (extra things that make all the difference)
Battery Operated Fairy Lights / LED Balloons / Glow Sticks and Flags
Something that you may not think of but really IS an essential is fairy lights to wrap around your buggy or an LED balloon to attach so that you can see at night.
Little kids will enjoy waving a glow stick and a flag is a great way to keep a group together (homemade is more distinctive!)
Unless you want to hang at the fringes the whole time, good quality ear defenders are an absolute must. Little ears are very sensitive and prolonged exposure to loud music at festivals can cause permanent damage. Amazon is a good place to find these.
Take some simple activities to keep little one entertained in the quiet periods around camp, stickers, colouring books, bubbles etc. Don't overdo the toys since most festivals will be entertaining enough (and you have enough to carry), but do be sure to pack any that little ones can't live without (maybe take a spare if the toy is 'critical')
Little ones love to dress up so take some extras like facepaint, glitter and outfits to help them get into the festival spirit.
First Aid Kit
Although the larger festivals will have well set up medical coverage, take your own kit so you can deal quickly with minor mischief. Stock it with useful bits like antihistamine cream, tic removers (especially if the site is on a farm or near woods), tweezers, antibacterial cream/wipes, pain relief, plasters, blister pads…..
Having a supply of healthy-ish snacks (think raisins, fruit bars, bread sticks, vege crisps, rice cakes etc) reduces the junk loading (some is inevitable) and will keep blood sugar levels where they need to be.
Take a refillable water bottle to save on plastic and keep littlies hydrated.
A Light Scarf... is a handy bit of kit to have on you as you can use it as a makeshift wrap, cover, blanket, sunshade, towel.....
Duct tape. Ask a kiwi and they'll tell you they don't go anywhere without a roll of this as it can be used to fix or fashion just about anything at moments notice. Life changer :)