What baby "no-nos" have you committed? For me its, 1. Sleeping on Tummy. 2. Using baby cot bumpers.

Letting baby get used to nursing to sleep + leaving her alone asleep in the room when she had already learned object permanence = baby still not sleeping through the night at almost 1yo :( Learn from my mistake and read this early! https://www.preciouslittlesleep.com/what-you-need-to-know-about-sleeping-through-the-night-part-i/

Neglecting oral care. I have now learnt not to give LO milk in bed once teeth have erupted. This will increase the risk of developing cavities.

Not burping a breastfed baby - I thought you didn't need to burp a non bottle fed baby