XB

 Yes — West Bengal is already below replacement fertility rate.

• Replacement level fertility ≈ 2.1 children per woman (population stable without migration).
• West Bengal’s Total Fertility Rate (TFR) has been well below this for years:
• Around 1.8 in NFHS-4 (2015-16) — already below replacement.  
• Around 1.4 in 2020 (Registrar General data).  
• About 1.3 in 2023 (Sample Registration System report).  

So West Bengal is not just “reduced” — it is significantly below replacement, meaning:

• Population growth slows
• Ageing increases
• Long-term decline possible without migration

This puts West Bengal in the same demographic phase as:

• Southern India (Kerala, Tamil Nadu)
• East Asia (Japan, South Korea style trajectory)

Main reasons cited:

• Higher female literacy
• Later marriage
• Urbanization
• Cost of raising children
  These factors are linked to the recent fall in TFR in the state.  

If you want, I can also show:

•  religion-wise fertility in West Bengal
•  district-wise WB fertility
•  comparison: WB vs Bihar vs India
•  future population projection

Just tell me.