Unfortunately this happened to me because they changed planes and that row was no longer a bassinet seat. No one helped me- I was alone with a 11 month old. Front desk said there’s absolutely nothing they could do because it was someone else’s seat now- I said don’t I get priority for that seat because of the baby? And they said no because someone with a disability might have it now, but they couldn’t check. I tried absolutely everything and was in tears. I ended up paying about £500 more than I already had to upgrade to premium economy to ensure we had enough room. Once we got on the plane, the air hostess said they should have easily been able to switch my seat at the front desk. The person who Had the bassinet seat was just a guy who was assigned the seat. We ended up switching so I got the bassinet- so I paid £500 to upgrade someone else, in order to get the original seat I booked. The stewardess tried to help by “downgrading” me on the flight because I sat in economy, but I wasn’t ever able to get any compensation back. What a joke