Originally posted by: Krishnpriya
Didi,did Vasudev & Devaki know the real identity of Krishna or they thought of him as a miracle baby? I have seen in some shows that Narayan gave darshan to them after Krishna's birth also some even say that Devaki's pregnancy was just an illusion as God can't be born out of the human union and Narayan just placed baby Krishna in the prison cell and guided Vasudev to take Krishna to Nanadbaba's home.
  Krishna Sakhi, π€to understand the entire Leela , first let us know the reasons behind the inordinate amount of tragedy that Devaki faced in her lifetime. 
Maharshi Marici and Urna Devi had six demi-gods like sons. Once the Universal Grandsire, Brahma, was running after his daughter Saraswati, trying to placate her for some reason. These six boys happened to see this scene and were impudent enough to laugh at the scenario.
Unfortunately for them, Brahma noticed, and enraged, he cursed them to be born as Daityas in their next lifetime. By virtue of this curse, they were born as sons of Kalanemi and grandsons of Hiranyakasipu in their next birth. Now Hiranyakasipu was one of the most famous offsprings of Diti, hence a very powerful Daitya, who hated Brahma. But these six sons were nothing like their grandfather or father and secretly admired Brahma.
Secretly admiring him was fine, but they went to the extent of performing severe austerities for receiving a boon from Brahma, he was pleased with their dedication, appeared to them, and gave them the boon of protection from death in that lifetime! But things went wrong when Hiranyakasipu found out about this. Enraged that they would worship the God that he hated and that he couldnβt even harm them because of the boon that they had received from Brahma, he cursed them.
The curse dictated that in their next lifetime they would all be killed immediately after their birth. These six sons were the same six sons that Devaki gave birth before Krishna. She named them Hamsa, Suvikrama, Kratha, Damana, Ripumardana and Krodhahanta. Together, they are known as Sad-Garbha. They were killed by Kansa upon birth, who was, as mentioned earlier, a reincarnation of Kalanemi. Hence, Hiranyakasipuβs curse was fulfilled.
The seventh time Devaki was pregnant, it was Balaram in her womb, but by divine design, this fetus was transferred to Vasudevβs other wife Rohini's womb who was safe in Gokul. Hence Balaram was saved and here in Mathura, it seemed like Devaki had gone through a miscarriage. Finally, the eighth time, she was pregnant with Lord Krishna.
Much later, after Krishna had grown up and was in Mathura, Devaki placed a request before him. She had heard how he had brought Sandipani Muniβs son back to life and trusted that he could do the same with the six sons that she had lost. This is when Krishna traveled to Sutala Puri, where the souls of these six sons were residing, under the King of the Daityas, Bali.
When he explained their history to Bali, Bali released them to Krishna, who in turn took them back to Devaki. After a brief reunion of Mother and sons, they finally broke free of their curse and returned to the abode of the demi-gods. Devaki was very much aware of her son's Divine powers! 
According to Bhagavata Purana, Krishna was born without a sexual union, but by divine "mental transmission" from the mind of Vasudeva into the womb of Devaki. In the story of Krishna, the deity is the agent of conception and also the offspring. Because of his sympathy for the earth, the divine Vishnu himself descended into the womb of Devaki and was born as her son. In the Vishnu Purana: "Devaki bore in her womb the lotus-eyed deity...before the birth of Krishna, no one βcould bear to gaze upon Devaki, from the light that invested her, and those who contemplated her radiance felt their minds disturbed.β Vasudeva once mentioned this to her and with a serene smile, she told her husband that now she is going to become the mother of a God who will save them from this prison! Later, when Vasudev returned from Gokul after leaving the newly born infant there, he narrated how the Yamuna parted to make way for his safe travel to Gokul and how Nature arranged everything for his secret mission. 
And most importantly, all were heard when Akashvani announced the arrival of God to earth as Devaki's 8th son, it is a foregone conclusion, a well-known fact that God is going to descend to the earth as her son!