how much money should I put away a week ? 🤰🏼

Tayla🌼 • Two daughters 🌸🌸 13month Gap. 👶🏼 👶🏼 👼 healing from loss 😭 at 11 weeks pregnant. NOW -🌈 👶🏼 on board
I'm expecting in October im nearly 13 weeks. How much money should my husband and I be putting away a week to save money to buy baby things ?