I bought the little sachets of calpol, they’re pretty understanding about products for baby, but I wouldn’t risk a full bottle of calpol unless you buy it to pick up at a boots at the airport.
Calpol comes in 100ml bottles so you should be fine although we have bought it at airport last few times to save messing. You can take sealed ready made cartons through no problem just tell them at security as they wk scan the separately. We’ve done click and collect at boots before now you pay the high street price and collect after security and it saves on messing.
No liquid limit, fill your bag up and just take it out at security for a quick check. We took 8 bottles worth of formula tabs, 2 flasks of water, a bottle of Calpol and tons of pouches x
We had both in our hand luggage, no issues at all.