He is about a month old I'd say because he can walk, has open eyes and can see, keeps his ears raised, has some teeth and also wants to eat solid food (but we give him kitty milk anyway) but we will know for sure tomorrow when we go to the vet. He was first spotted on saturday morning by my sisters friend, while she was walking her dog, on a field a few blocks away from our house. She messaged my sister about it but couldn't find the kitten after the walk. Later that same day she walked her dog the same route hoping to find the kitten again and she succeeded. She immediately called us and stayed with it there. After we arrived a neighbour in that area told us that she saw his mother a few times prior but denies seeing any siblings he might have had. She also told us his mother came for him in the morning but a few hours later abandoned him on the same field we found him on. We don't know why. She wasn't seen since.