Birth: 16 November 1657 Bishopsgate Without, Middlesex, UK
Father: John Croucher (Chroucher, Croutcher, Crowcher) c1630-a1667
Mother: Margaret Baker b1638-a1667
Christening: 29 November 1657 St Botolph-without-Bishopsgate, Middlesex, UK
Death: Before 1667
Birth of John Croucher in the IGI on 16 November 1657 and his christening on 29 November 1657 at Saint Botolph, Bishopsgate, London, parents John and Margaret Croucher.
Another John was christened in 1667 so I assume this one died before then.
Saint Botolph (St Botolph-without-Bishopsgate) was in Bishopsgate Without indicating it was in Middlesex and not in London.