Hi Day - here's a brilliant twin weight tracker I referred to in my pregnancy hun. According to it your boys are right on track
![Smile :) :)](/styles/default/xenforo/smilies/icon_smile.gif)
https://www.twinstuff.com/twinweights.htm
In general twins and singletons follow the same growth curve up to 30wks after which twin weight gain slows down due to lack of space compared to a singleton (someone should have told mine that lol). From what I remember my twins were about 3 and 4Ibs at 28wks.
Great news is that twins tend to have a more rapid organ development before 30wks - mother nature anticipates premature delivery with twins and so equips them better to deal with life outside the womb IF they do come early.
Wunder, can't believe you're getting grief for pointing out 28wk/IC trend on other boards. As you said, it isn't that an IC stops being vulnerable after 26wks, (it can still open 'silently), but because an IC tends only to open without contractions to 3/4cms at most, it needs strong regular contractions to open further than this. At that point the baby is in general too large to simply deliver through a 3/4cm gap, the cervix needs to be dilated further. Whilst IC isn't a threat directly, there is still a chance that by dilating to 3/4 ptl could be triggered as a seperate but not strictly unrelated issue. Maybe this is what other boards are driving at?
Ptl due to a dilating cervix can happen at any gestation but since an incompetent cervix tends to dilate early on (around 20wks), the chances are if it were going to cause the associated ptl it would have done so by 26wks.
So in brief, a truly incompetent cervix without a stitch is usually signifcantly dilated well before 28wks. A cervix which holds and dilates past this point is usually dilated for a reason other than IC and probably because of ptl due to other pregnancy complications. The two conditions are not mutually exclusive, and are often related but ptl (if it arises as a result of IC) typically happens well before 28wks. At 28wks the IC threat (as a purely mechanical, cervix open 'baby comes out' condition) has essentially passed. Ptl triggered by it is also less likely if the cervix has remained stable to that point, but is still a possibility - that possibility decreasing as each week past 24 passes by.
A cervix can dilate without contractions at any point, but is less of a problem and less likely IC-related the further along you are. Ptl on the other hand is a risk throughout, a risk as a direct result of IC only between weeks 16 and 24. If your issue is purely IC, and your cervix is looking stable at 25wks then the condition itself poses less of a threat after that point. If it has held up reasonably well by a certain point then it likely will continue to do so - IC is a condition which definitely shows itself sooner rather than later.
Sorry for the waffle, hard to explain in writing - hope it made some sense xxx