Is it possible for a baby born to a woman with hpv vires type16 to transmit hpv vires in the placenta?(the" ncbi.nlm.nih.gov" website states that this could happen) is there any chance of this happening?

In medicine we are taught to never say never. That said I have not seen this reported as happening in 4 decades as a pediatrician. If you remain paranoid with any level of risk don't have babies. There is a baseline risk of 4% of any pregnancy having some sort of unexpected outcome. including genetic/birth defect/premi/etc. Genital HPV transmission appears to require skin to skin genital contact.