AIR selusuh?

During my O&G posting, i've come across many patients who came due to contraction..and the staff nurses and some of my Medical officers ( even nonmuslims) would often ask whether patients had used 'air selusuh?'..i was perplexed as to what is air selusuh..these kind of patient usually have good contractions - roughly about once to twice every ten minutes, however, the cervical dilatation is usually still small - less than 4 cm.

Fortunately I had come across this one book entitled "Ensiklopedi Perbidanan Melayu" written by Anisah Barakbah and had foreword written by Tun Dr siti hasmah and also Tan Sri Datuk Dr Hj mohd Ismail Merican ( he's the Ketua Pengarah Kesihatan Kementerian Kesihatan Malaysia- for those who are not aware of his position)

Here goes :
Mengikut petua Melayu, air selusuh merupakan satu daripada ikhtiar untuk memudahkan proses bersalin.

Petua yang mudah dipraktikkan sebagai air selusuh adalah dengan menelan tiitsn air dari hujung rambut yang dilurut turun ke dahi pada setiap kali mandi.
Selain itu, air seluruh dibuat daripada air hujan pada petang atau malam jumaat yang dibaca yasin 7X, basmallah 7x, dan dimulai with..(maksudnya ; Dengn nama Allah Yang maha Mendengar dn Maha Melihat)

sebagai ganti air hujan itu, air zamzam juga boleh dibuat air selusuh..

--these are some of the excerpts from the book..

after reading the fact,i've become a bit skeptic..hmm..so, this is what they mean by air selusuh..

I've got no comments ,however, i've not come across any sources based from any hadeeths regarding this ritual..if anyone has got anything legitimate regarding this air selusuh, i would be most grateful...