Required vaccinations

Based on health booklet, it only mentions the “age” e.g 1 month, 3 months etc Should the required vaccinations be done before LO turns 1 month? Or within that 1 month (before it reaches 2nd month). My LO is 2 weeks now. I called polyclinic to make appt for the 1 month vaccine and she gave me 23 Jan which means my LO will be 1 month and 2 weeks by then. I asked her about it and she said it’s supposed to do the vaccine after baby is 1 month. But I read that some ppl did the vaccine before LO turns 1 month. Wondering which is the correct way?