Hindi po, dapat talaga i-cool muna sa ref for a few hours before i-freeze, kasi ang sudden temperature change ay makakasira sa nutrients ng breastmilk! A few of us sa mommy group namin, nag-research kami tungkol dito kasi worried kami na nasasayang ang milk, at lagi kaming nagsasave sa ref first then freeze after a few hours para safe. Best to double-check din with your pedia or lactation consultant para sigurado ka sa storage guidelines, pero yan ang sinusundan namin at okay naman, and honestly mas peace of mind ko that way!