I used them for babies #2 & #3 and I found labour and delivery easier with #2 but though labour was a dream with #3 I can't say I noticed a difference when it came to #4
I found out about them when i waz 38w then took them for a week then stoped using them cuz i heard they didnt work if i waz to far along and had my bbygirl at 40w1d ,and my other kids had them at 38 weeks and didnt use or took nothing at all