We go a lot, there's lots of other things to do other than rides - water park (if open, check in advance), miniland, the shows, lego play, interactive walks (go past flight of the sky lion, head to the magical forest walkthrough experience after the water ride - you'll have to look for it as it's possible to miss it).
You can go on a lot of 'experience' rides - lego deep dive adventure, train, balloon school, coastguard HQ, everything in Duplo valley (except the coaster). If child is old enough there's lots they can do on their own too.
Obviously avoid the larger coasters (those in pirate shores, some in mythica and definitely avoid monster house party, it'll make you sick, and Viking valley) but they are great to walk around too.
Other option is Chessington, they have animals there which is great, shows and some, larger rides.
If you can afford it - go! The hotels are lovely too (the cheaper one is just as good as the other). However, avoid eating in the hotels, their food is terrible (in the park the food is as expected).
Also you can definitely go to Legoland with a baby so don't rule that out
Have fun!