@LizzieJalebi_ it's about nature vs. Nurture ,I believe. Nature , this is when we inherit the intelligence through genetics. On the other note;
Nurture, this is when we acquire those from the environment. For me, we are all unique individuals. We came from diverse culture,beliefs , and upbringing. Level of understanding varies and so as our capabilities. There is no such word as "stupid" (imo) it's just our ignorance to that thing. So, my answer would rebut this post's claimed of babies having same level of intelligence. Btw, we do have a lot of learning styles; this is where we can choose which style or technique we can learn more/efficiently, and learning disabilities. I absolutely agree with Howard Gardner's multiple intelligences which best suited to our uniqueness. It's just that school system set standards neglecting most of the intelligences that we possessed, it is more focused on the linguistic and logical intelligences. In a nutshell, everything can be learn, and learning is an unending process- you can't instantly know something without studying or investigating. :)