Changing of the Guards

I have never seen the formal changing if the guards, but I hear it is a mob scene. In comparison, I have witnessed the official ceremony at the Horse Guards building twice quite by chance and it was easy to see and access. It may be better for little people who can't see over a crowds' heads. I am no expert, but I think they leave there and head for Buckingham Palace. Not sure, but it is very cool to watch.

Edit to add: This may help.
https://www.householddivision.org.uk/queen-life-guard-schedule

Forget the Changing of the Guards. Massive disappointment.

Instead do as suggested and watch the Royal Horseguards Life Guards change ceremony. Double check the time but I believe it’s at 11am. You could then walk across the road to St James Park and look for the pelicans.

https://www.royalparks.org.uk/visit/parks/st-jamess-park/horse-guards-parade

https://www.royalparks.org.uk/visit/parks/st-jamess-park/pelicans-st-jamess-park

We watched the Changing of the Guard ceremony at Windsor Castle in front of St. George's Chapel. It is currently on Tues, Thurs and Saturday at 11am. (But double check the website prior to your trip to confirm which days, as it could change. ) We got there early enough to get in front, and it was fun to watch, which you'd really want to do with young children. It's a far more intimate setting than Buckingham Palace. Our then teenagers really enjoyed it as well. Afterwards, go into St George Chapel, and then tour the Castle. Get tickets in advance for everything. At the time we went, you didn't need a special ticket for the guard ceremony, (it was just part of admission) but that could be different now, so double check on that as well.

The ceremony is about 45 minutes and begins with the band or drum corps. We really enjoyed it! But if your kids, get restless, you can move on.

Definitely agree with the suggestion of watching the King's Life Guard change. Just walk through the archway at Horse Guards from Horse Guards Parade prior to the ceremony for the best view. The troops are from the Household Cavalry Mounted Regiment.

"I am no expert, but I think they leave there and head for Buckingham Palace."

I believe they come/go from Hyde Park Barracks. I've seen them enroute a few times. It's the foot guards of the Household Division on guard at the palace.

We wete just in alindon with our adult children and our 12 year old grandson.

We took the advice previously given on this forum buy some of theses posters and others and everyone was very happy with the Horseguards. Not crowded and easy to see for shorter kids and folks.

We saw the changing of the guard at Buckingham Palace on a group tour years ago and I don't remember a thing about it. Hopefully the Horse Guards or Windsor are better.