We just read it on the box. It is also in the FAQ:
Is that a leak? Because the Dr. Brown's bottle is
fully-vented it allows positive-pressure flow, similar to
breastfeeding. This is essential for the baby to feed without having to
suck against a vacuum. Under certain conditions the breastmilk or
formula can exit through the vent. For example if the liquid is
overheated the expanding air inside the bottle pushes the liquid
through the vent causing leakage. Or if the bottle is shaken to mix
formula, which we do not recommend, the liquid may enter the vent.
We have been mixing it in the bottles for months. Just loosen and retighten the top and any liquid in the vent will go down. I actually do it a couple times while feeding DD b/c liquid seems to get up there anyway.
I am just gonna shake before putting the tube thingy in..lol
That will work
that's what I do - I use a screw lid that came with my breastpump to cover the bottle. After the formula is mixed, I put the rest of the bottle together.
Re: why can't you mix the formula in the dr brown bottles?
We just read it on the box. It is also in the FAQ:
Is that a leak?
Because the Dr. Brown's bottle is fully-vented it allows positive-pressure flow, similar to breastfeeding. This is essential for the baby to feed without having to suck against a vacuum. Under certain conditions the breastmilk or formula can exit through the vent. For example if the liquid is overheated the expanding air inside the bottle pushes the liquid through the vent causing leakage. Or if the bottle is shaken to mix formula, which we do not recommend, the liquid may enter the vent.
{Ava 5.16.06} {Ella 12.29.07} {Drew 2.9.10}
I always shake.
I read somewhere that if a lot of liquid gets in the vent, to loosen the top and then retighten it and that will let the liquid out of the vent.
I am just gonna shake before putting the tube thingy in..lol
That will work