Yellow baby tooth! 6 month old

hi everyone! Thankyou for taking the time to read this post. I am a mum of 3 2 boys 6 and 4 and a little girl who is 6 months old. She has just got her two front teeth for Christmas! We all had a joke about that and sang the song! One of her teeth has come through slightly yellow and the other perfectly white. I took her to the dentist today who reassured me it is nothing to worry about as it’s caused by fluoride in water from myself while pregnant. I just wanted to know if anyone else has any similar experiences. Did it go away? did more come in yellow or just the one? Did the adult teeth come in fine! Thanks for your help and I look forward to reading he replies xxxxx