welcome to HealthcareMagic
Since you have a 5 yrs baby and trying for second child your case is of secondary infertility
and this time since your reports are normal it is secondary male infertility
.In males secondary infertility can be due to low sperm count
because of Varicocele or any infection suffered in recent past and it needs to be investigated and treated.Please consult an Andrologist/Urologist
and he will examine your husband and get treated.
All the best