DS's six month needles were way better than 4 months. We had a very bad reaction to 4 month ones that lasted about 2 weeks so i was just dreading them. Amazingly the only effect we had from these was he was just a little bit more sleepy. I think it was only 2 needles (I think, i had my eyes shut) and the doctor and nurse did them at the exact same time. He screamed of course but was fine after a minute or so. As Jodi said, my DS was also out in the waiting room smiling and charming everyone too and they were amazed because they had heard him scream. Good luck