You posted this, 18 months after the last response, to speak out on this topic? Weird.
Unless these "other" programs are lying, you are mostly wrong. The ABA is explicitly clear in their guidelines about total amount of days allowed off during CA years 1-3. If you go over, even with pregnancy or illness or bereavement, you will have to make up time. For many females, this means you could owe time at the end of residency - virtually guaranteed if you had more than 1 child during training. I think every female in my program owed at least a couple weeks for this reason - jobs and fellowships understand and adjust accordingly.
There are some ways to work around this - for example, allowing a resident to complete a research elective or something of the like from home during this time. Or come back "full time" doing half days on a pre-op clinic rotation (2 weeks allowed). There is restrictive language on this by the ABA, but definitely possible for 4 weeks (and maybe more). FMLA is a federal requirement (BUT you have to be employed > 1 year at most institutions to qualify for full leave with pay!), and they are forced to allow you to take off but a full 8 weeks off virtually guarantees added time at the end of training.
BTW, other training programs run into this as well.