It isn't true that you can miscarry due to heaving lifting.
Miscarriage is not due to sexual intercourse, stress, loud noises, frightening the baby, being hit in the stomach or heaving lifting.
Heaving lifting will hurt you way before it ever hurts the baby.
The worst it may due is tear the placenta, but that is an extreme case. In most cases the placenta will heal itself anyways.
You sisters miscarriage is unfortunate but not due to her heavy lifting.
Most miscarriages are due to chromosomal and hormonal abnormalities.
Miscarriage is not due to sexual intercourse, stress, loud noises, frightening the baby, being hit in the stomach or heaving lifting.
Heaving lifting will hurt you way before it ever hurts the baby.
The worst it may due is tear the placenta, but that is an extreme case. In most cases the placenta will heal itself anyways.
You sisters miscarriage is unfortunate but not due to her heavy lifting.
Most miscarriages are due to chromosomal and hormonal abnormalities.