Shopping rant

My husband and I usually have to grocery shop weekly for the 2 of us. We spent 150 last week and are already out of food. This annoys me because it's super expensive lately and our son isn't even born yet. So I'm only feeding us. When he can eat solids it'll be more I'm sure. I don't mind but I feel like we don't shop cleverly. We try and get cheaper brand things. Don't splurge on expensive things like lobster or steak unless it's special occasion. Does anyone else feel like their groceries don't last or their money doesn't stretch far?