Okay, in a lot of pop culture, blood transfusions can give you superpowers. In Metroid, Samus Aran was given Chozo blood to enhance her strength so that she can survive Zebes' gravity. Zebes having a ridiculously high surface gravity of 960 g seems next-to impossible, especially if it's smaller than Earth. Unless there's a neutron star or something in its core that accounts for a large amount of its mass. As Zebes has a radius of .816 Earth radii, if it had Earth's density, it would have .544 Earth masses. Humans cannot move around in a gravity greater than 5 g, so let's say that Zebes has a surface gravity of 5.71 g, due to being about 7 times denser than Earth. Sure, there will still need for superdense material in its core, but that's far more realistic than in-game lore (which even uses incorrect units) suggests.
Zebes is made primarily of urthic ore, which we can assume to be a very lightweight, albeit very strong species of space rock. This is because it has properties that allow for massive underground caverns, and with building underground caverns, you want to prioritize strong, low-density materials. So, most of Zebes' mass must be packed into that superdense core. Anyways, Chozo blood has properties that if inserted into a human bloodstream, it will begin modifying their muscles and bones to be much stronger, so that Samus can survive the high gravity of Zebes unaided. Samus is 1.98 m tall, and weighs 98 kg, so her BMI is about 25, so she's mildly overweight. So, either she has a slow metabolism or the strengthening of her muscles and bones increased her tissue density a bit.
What I'm asking is, "What biomechanism would allow you to increase a human child's strength to superhuman levels if you stuck some bird blood in her veins?" I know that the Chozo blood had to affect Samus' DNA, so that it would code for her to be strong enough to not have to be knighted Dame Breaksbonesalot just from walking on her adopted homeworld's soil.