Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,170
OTAs are notorious for missing out on such things as extra guest charges at hotels, incorrect checked luggage policies, etc.
A lap infant is never going to be 100% free - the OTA is simply not set up to appropriately handle airline rules - so book via an OTA at your peril.