DS had his 8 weeks jabs done on schedule. Now I've just realised that owing to nurse sickness, appointment bureaucracy and me generally being shit/busy, he will be nearly 15 weeks when he gets his '12 weeks' 
How bad is this? I am hugely pro vacc and was so prompt with DS1. Are there any risks to this? I presume his next set - 16 weeks - will have to wait a month now?