It was pointed out at our 18 week ultrasound that our baby's bladder was not emptying. It was followed up with monthly, then biweekly ultrasounds where we saw his bladder getting bigger and bigger. We were told that he was letting urine out, because the amniotic fluid level was normal. Other than hyperemesis gravidarum, the only abnormality during the pregnancy was a low Pap A level on the 12 week screening and nucal translucency. When he was born (via caesarean because his abdomen was so large), he was catheterized for 800mL of urine. He has required intermittent catheterization (currently every 4 hours) since then, and he is now 4 months and we still do not have a diagnosis. He has had 3 VCUGs, spinal ultrasounds, urodynamic testing, and cystoscopy, the only finding of which is a large "floppy" bladder. He does occassionally void, but has residuals between 60 and 100mL. When he does void, it is a stream, so there is force behind it. Also, he has no other problems that would indicate a nerve disorder. Our urologist keeps calling it atonic bladder, but that irks me. He has tone, otherwise he wouldn't be voiding at all, let alone a forceful stream of urine. Sometimes he can actually push the catheter out of his urethra. We are frustrated and hope that you might have some prior experience with this sort of thing. Thank you.