One of the biggest sidequests is Mother MaiaMia, who has lost her 100 babies across Hyrule and Lorule. For every 10 babies you find, she'll upgrade your rented items from Ravio. Find them all tolearn a powerful, upgraded spin attack. First talk to Mother MaiaMia to start the quest by heading just southeast of Link's house toward Lake Hylia. Look along the northern edge of the water to find a blocked cave with a sign warning of a monster inside. Use a Bomb to open the cave and talk to Mother MaiaMia, then find all 100 babies by searching the following places:
On the wall behind Link's house.
Use the Pegasus Boots to ram into a tree just west of Link's house.
Under a large boulder south of Link's house. To get there, you have to merge through a nearby rift to Lorule, then merge back through the other nearby rift.
Use the Pegasus Boots to ram into a tree just south of the Blacksmith, inside the enclosed woods area.
Head to the Blacksmith and blow away the tiles on the left side of his house with the Tornado Rod, revealing a baby underneath.
East of the Blacksmith there are more tiles. Use the Tornado Rod again to reveal another baby.
North of the Blacksmith are some trees, including one by a rock. Use a Pegasus Boots charge to shake a baby loose from its branches.
Use the Pegasus Boots to ram against the tree along Hyrule Castle's west wall. Another baby will be shaken loose.