There hasn't really been any problems pre-takeover with infant seating.
After the take over thou it was slightly different. I have been handling flybe for 2 years and there hasn't been any problems til 25th march onwards, and its to do with the EMB145 as it has specific rows for infants, as they have extra oxygen masks for the infants (as mentioned before by cabingirl). All it is now, is for the staff to become familiar with the rows they are meant to be sat in and locating them on the manifest to prebook them a seat before the masses turn up. All it is is fine tuning.
Everyone is doing an excellent job all round. Its only been a month after the change over, and it has been a big step forward for everyone, so well done again