My DD aged 4 has just been asked to go for the MMR booster jab. We decided to give her the first vaccinations as single jabs as I was concerned it was an awful lot of stuff for her little body to cope with at one time. Now she is older I think I feel much happier letting her have them all in one go (and it saves me £300!). I would be interested in hearing from anyone who did single jabs the first time round and then just the one vaccination at age 4. Did you feel it was okay to do the one jab now they are older?