Have been wondering about this myself. Read all the guidelines and a lot of research.
If you're going on statistics argument then all single mothers should get a partner or get married quick!
Accordimg to Lullaby Trust:
The rate of unexplained infant deaths for babies born outside marriage, and registered by the mother only, was 0.91 per 1,000 live births.
Thats 3 times the rate of married mothers!
Do what you feel is right for you. If you dont smoke, breast feed and out your baby to sleep on it's back or let it cover it's face or get too hot then
Your ticking all the other boxes.
Nobody argues that all mothers that feed formula are puttimg their baby at a greater risk of SIDS they wouldnt dare
But the sids guidelines clearly state:
THINGS YOU CAN DO:
Always place your baby on their back to sleep
Keep your baby smoke free during pregnancy and after birth
Place your baby to sleep in a separate cot or Moses basket in the same room as you for the first 6 months
Breastfeed your baby, if you can
Use a firm, flat, waterproof mattress in good condition