straw sippy cups - what am I doing wrong?

jen_aggie05

DS uses the sippy cups with the silicone straws. Everytime I leave it sitting on the counter, milk or water comes shooting up the straw and five minutes later, the sippy cup is in a puddle on the counter. What am I doing wrong? Is there a valve that I need to open? I think there is so much pressure that it just shoots out the top.  I know I'm not overfilling them because they do this even if there is just one inch of fluids in it.  Surely there has to be a trick to this because all of our straw sippy cups do this regardless of brand.  Any ideas? Thanks!

Renee070806

two of my friends use these cups for their los and NEVER have that problem

me on the other hand...........happens all.the.time!  i think sometimes when ds stops drinking he blows air back into the cup ..or something, i dont know!  before i leave it on a counter or put it back in the fridge i twist the top off and put it back on and that seems to work.

has your dc figured out how to turn it upside and bang it harder than ever to get liquid to pour out of it?  ds discovered that trick in his carseat on the way to my dentist.  he was covered in milk! 

Temp174496125006552

We only use the Nuby straw sippies and I've never had this happen.  Weird.

Renee070806

oh..p.s. ours are munchkin

Deltadee

I have the Platex straw cups for DD and this happens to me about every other day.  It is so frustrating!  i would prefer not to use the straw cups because of this reason but DD loves them so whatcha gonna do?  I have one of the Munchkin brands cups and it doesn't leak though.

trplL06

This only happens to us when the liquid is very cold.  It happens especially if we had it in the fridge and bring it out to room temp.  Something to due with temps and expanding liquids I believe.