SSounds plent0y to me, buffets definitely good food wise, esp. as you do't need to pay for your little one, Budgeting a certain amount a day is very helpful, just remember that since you're driving, depending on your route, you may need money for toll booths, (if traving from Calais this will be about 22 euros each way, and you may need some money for fuel?) We generally take a 100 a day not including food, and that's for 6 of us so you should be fine. Have a great time!