I do not find the words to "Tengkurep" in English. might also be it's tummy time.Today we (my mom n me) try again for the yogi to Tengkurep. I personally like it when she slept tengkurep.
They said, It'll give a chance to rest for the back of the baby's head, helping to strengthen the muscles of your baby's neck, in preparation for crawling, to help accelerate the baby's ability to lift the bottom, roll over, sit down, until finally stood up, to help improve your baby's motor development, fostering leg muscles (from tipsbayi.com).
Now, my baby age 3 weeks and can move his head by himself. Hopefully what is told from the article correctly. so my baby can be more quickly to lift the buttocks, sitting, standing and eventually walking. Can't wait for that moment.