I know this is a little late, but my NJ tube is an 8 fr.
Also just want to update part of this tread. I had two NJ tubes with my first pregnancy and one so far during this one. In my first pregnancy they were in for 8 and then 11 weeks before clogging. This current one have been in a little past 11 weeks and is still working.
Also, be very careful with crushing pills and sending them through as it can clog the tube faster. Zofran comes in and oral liquid that can be added directly to the tube and I find it works even better than the ODT tablets. Also if you add Miralax (dissolved in water) you wont suffer the horrible zofran rocks.
I can't say enough good things about my tube!
Amelia, born 6/29/09 - Severe HG for 37 weeks: zofran, multiple mid-lines, NJ tubes and hospitalizations.
Baby Angel, February 2011
New baby due 02/25/12 - severe HG starting at 5
weeks. Zofran, Prilosec, Miralax and enteral feeding through NJ tube since week 7.