Could Yellowish Tinge In Skin Be Related To Vesicoureteral Reflux (VUR)?

Question: hi, I have a 7 month old baby boy. he was born with sepsis for which he was treated with iv antibiotics, cause of sepsis was not established. at around 8 weeks he began to slow in his weight gain and feeding ( exclusively breastfed) became poor, was admitted to hospital age 4mths weighing 10lbs (born at 8lbs 5 oz). in hospital it was suggested he was cows milk protein intolerant as his skin would blotch when fed and also he had severe reflux. also it was established that he had a uti and a tongue tie. treated with antibiotics and tongue tie was snipped a month later. 3 months on weight gain is now much improved, I am continuing to breastfeed and follow a dairy free diet, my son has started some soilids, mainly fruit and vegetables. on follow up appointment to consultant, he suggested that my son should have further testing to see if there is any kidney scarring caused by uti, and if he has VUR. my son has always appeared to me to have a very yellowish tinge to his skin, he did have raised ALT levels in LFT's, these are now considered to be normal, my query is could this yellowish tinge be related to VUR, and what is the likelihood of my son having VUR? he does not have very many really wet nappies. he appears otherwise well, but does sllep considerably more than my other two children did at this age, 11 hours at night and 3 naps during the day varying between 1 and 2 hours. many thanks XXXXXXX

Many thanks for your reply, I forgot to add in my original question that my son has already had the ultra sound scan of kidneys, bladder and ureter, the results of this scan were clear with no abnormalities detected. the net tests I believe involve radioactive XXXXXXX test and a catheter test? are these routinely performed in the case of a uti and can they show up problems which the ultrasound does not pick up? The last blood LFT came back as normal, however as previously mentioned my son does still appear to have yellowish skin, but there are no further investigations planned for this. I also forgot to mention that his head circumference has gone up two centiles in 3 months, the consultant has said they will perform a head scan, what can they tell from this scan? many thanks