I have an eight month old with EXACTLY the same. I am a GP and assumed he has a uti. I managed to get a clean catch sample this morning using a urosheath and my GP just phoned to say it is absolutely clear on dipstick but they will send to the lab. Therefore unlikely to be a uti.
My baby is EBF, not great with solids yet, poor at drinking from a sucky cup but drinks plenty from the breast, plenty wet nappies, recent mild cold.
I have no idea what is causing it. I know that a hormone is secreted during teething but my understanding is that it shouldn’t change the smell of the urine.
No other ideas I am afraid. My little one seems really well in himself.
Let me know if you find anything else!