The birth-rate didn't drop in the 30-34, 35-39 or 40+ age groups; while vaccines are increasing still births, miscarriages and lowering fertility, their main effect seems to be autism, allergies, etc. and most of the decrease in under 20's, 20-24 and 25-29 is likely due to social engineering.

My sister (we're Irish but being socially engineered at the same pace as the UK) had her first baby at 30, and my sister in law at 29.

'The new normal'..