Adults and older children can be just as disruptive too.
How is it decided which adults are going to be disruptive and ban them?

I think for some events babies should be left at home. I have nothing against babies at all and I love them to bits. I just think parents should take stock of where they are taking their babies to and if its appropriate.

When a parent wants to attend an event where they know children will not be able to stay quiet or still, surely they can arrange for a baby sitter to look after the children at home.

Seriously – professional tennis players are so focused that I would be surprised if a baby crying was an issue! I have no problem with children attending any sporting event – families should be encouraged to get out and about and families can be noisy and parents do deal with their children by feeding them or changing nappies, etc. I do understand bubs attending bubs and mums movie sessions as it is nicer for mums and bubs. But, to be honest it is only ever adults I have asked at cinemas to be quiet due to chatting through a movie. I personally love the mixture of people at events and witnessing children hearing or seeing something new for the first time is delightful! Our communities are made up of all ages and stages.

I understand that crying babies can cause much distraction at tennis or other games and also at cinema’s and concerned.
Personally I never brought my babies to these events for exactly these reasons.

You hear them on tv asking for “quiet please” during tennis matches, why you would think it was an appropriate place for a very young child is beyond me

Being a parent means making sacrifices and that means skipping the tennis and watching on TV for a couple of years. And its not fair to take an infant to sit in 30°C plus temperatures all day. Being a parent is putting the things you want last.
Same with the movies. They have cry baby sessions specifically so you can go with a baby and not disturb other people.

Difficult… It happened to me to go to some classical concerts and I admit that hearing kids crying let me lost the concentration.