Hi mum, I went through this phase also and it can be really frustrating when baby suddenly refuses the bottle after previously taking it well. At around 3 months, it can be due to things like flow change, baby preferring breast more, or even just a short-term feeding strike, so it doesn’t always mean something is wrong. What helped me was trying different bottle teats, offering when baby is a bit sleepy instead of fully awake, and not forcing too hard because it can make them more resistant. If it continues for more than a week or baby’s wet diapers drop, then better to check with PD just to be safe.