Pinoy dads, how can we deal with wives showing signs of depression?

Try to be more affectionate and empathize with her situation. It's always best to talk it out and let her know that you are always on her side. You don't need to bluntly ask if she's depressed. Start with small talks. Ask her if she's okay, how is her day and how you could help her make her day better. Depression is real especially for SAHMs. I hope this helps :)