Thinking of taking baby to Barcelona...Poss 1month old!!

Hi All

I am thinking of booking up to go to Barcelona for 2/3 nights at the end of April... my only problem is my baby hasnt been born yet! 'It' is due at the end of Feb '14, so i have worked out that a worst case if i have 'it' at 42 weeks it will only be 5 weeks old by the time we fly.

Can anyone give me any advice on this... does anyone have experience with a similar synario?