Probably Tom had enough of seeing his wife breastfeed their kids. It had taken over his marital life. Maybe he had enough of playing a father. As a mother, breastfeeding your child is inevitable and a mother does that with all her love. Though this is a natural and universal act, breastfeeding is still seen as a taboo and women feel a little uncomfortable in doing so publically. Jackie did the same and the waitress had her eyes on her husband.