It seems like a lot of parents get confused about these blocks hopefully this little cheat sheet below will help decide what is the best fit for your child.
LEGO AND MEGA BLOKS ARE BRANDS/MAKER NOT THE ACTUAL NAMES OF THE SIZES OF BLOCKS
Lego and Mega blok blocks can be used together and are interchangeable between each other in the medium and small sizes only. The only difference between the two brands are the plastic they are made of. Lego plastic is heavier and more durable whereas Mega Bloks blocks are made from a lighter plastic.Mega Blok makes Large(Maxi Blocks) Medium (Duplo Blocks) and Small (Small blocks) sizes,Lego makes Large(Quatro Blocks) Medium (Duplo Blocks) and Small (Small Block) sizes
Lego Quatros – Ages 1 to 3 Years
Mega Blok Maxi Blocks – Ages 1 year and up
Lego Duplo Blocks and Mega Blok Duplo Blocks- Ages 2 to 4 years
Lego Small Block and Mega Blok Small Block - Ages 5 and up