Red marks on your shoulders or torso, or underwire pinching breast tissue.
Breast tissue spilling over the top or sides of the cups.
Do not wait for a specific week if you experience these indicators of a poor fit:
Your ribcage naturally widens during pregnancy; if the band digs in even on the loosest hook, you need to size up. Shopping and Sizing Tips
This is the "sweet spot" for purchasing your primary nursing bras. Experts recommend starting with 3 to 5 bras —one to wear, one to wash, and one on standby—to manage frequent leaks and laundry.
Focus on comfort. If your pre-pregnancy bras feel tight or sensitive, switch to soft, stretchy, wireless maternity bras.