Baby didn't got tooth yet. Should i do?

Hi my baby is 9mon bw -2.75 kg now 7.8kg for 6 1/2 months I was exclusively breastfeeding after that we gave normally home food but in a low quantity now giving what we eat.still now breastfeeding not giving cow's milk .She is active and looking normal.But my concern somewhere I heard that hair and teeth is related Now during her birth she had lots of hair and thickness that time due to blood group incompatibility she had bilirubin so that thyroid level was within limit but only a point down now I don't know what's her thyroid level but doctor didn't said that she has thyroid so it's within limit.After phototherapy she recovered we came home usually babies hair fall and grow again but since from 6th month her hair is growing but very slowly not yet got her first tooth.I am so concerned now yes everyone saying can wait till 15months but I want to know from my side what should I give to her ,would it be any nutritional deficiency her nails growing normally.Now what should I do???