Uy, 4 days na talaga? Kahit mixed fed babies, yan ay medyo matagal na, especially sa age niya, kailangan talaga i-check ng doctor para ma-rule out kung may constipation or if she needs adjustment sa feeding. A few of us had the same worry at iba-ibang reasons pala, so better safe than sorry na lang, di ba? In the meantime, try gentle belly massage or warm compress, pero really, get her checked po talaga so she's okay and comfortable. Hoping baby feels better soon!