Lex is five and a half months and I think about 5 or so pounds now. I have to weigh him again. His size is very deceptive. He is small looking but has the weight some where....lol.
Anyhow we don't really take long walks like that. Things are usually rushed being as I have three kids (9, 6 and almost two) and work full time. As the weather gets nicer the kids and I will be taking our nightly half hour walks so he will be along for that one. Lex gets a ton of exercise during the day playing with my son and our Siamese Cat April. SO I guess for now that makes up for my lack of walk time. He and April really play hard.