Immunization pause

Hi All, My LO was given two vaccination shots in hospital, and we went for another 2 at around 6 weeks. Since the pandemic, hubby and I have decided to hold off all vaccination to avoid going to crowded places such as hospital and clinic. I have been practicing social isolation for my child and myself for past couple of months too. Is anyone else like us? I was told it's ok to delay the immunization, so long as we complete all before primary school. But I'm still unsure. Is there any concerns I should be aware of?