Different stages are used for different stages of the baby's development. The hole in the nipple is actually larger, or in some there are more holes which allows a faster flow. if you look at the different stages it will tell you on the package the age the suggest the stage be used for. Also if your baby seems to be sucking too hard and getting nothing or even like he/she seems to be drowning because of too much, you would want to change nipples.
She is going to have a baby.
Baby's bottle.
Baby Bottle
Baby's bottle.
It means that the baby cat is likely to be a female. Please note that male cats can have nipples too, so the best way to identify the gender is to look at the genitals under the kitten's tail.
they have crippled nipples:)
darker nipples
In baby language " baba" means stop, but mostly babies use that word for the meaning "bottle"
Nipples.
Could mean more than 1 baby
nipples..
Your boobies are growing