18 She brought them over the Red Sea, and led them through deep waters; 19 but she drowned their enemies, and cast them up from the depth of the sea. 20 Therefore the righteous plundered the ungodly; they sang hymns, O Lord, to your holy name, and praised with one accord your defending hand; 21 for wisdom opened the mouths of those who were mute, and made the tongues of infants speak clearly.

The Sages taught in a baraita that Rabbi Yosei HaGelili taught: At the time that the Jewish people ascended from the sea they resolved to sing a song of gratitude to God. And how did they recite this song? If a baby was lying on his mother's lap or an infant was nursing from his mother's breasts, once they saw the Divine Presence, the baby straightened his neck and the infant dropped the breast from his mouth, and they recited 'This is my God and I will glorify Him' (Exodus 15:2). As it is stated: 'Out of the mouths of babies and sucklings You have founded strength' (Psalms 8:3). Rabbi Meir would say: From where is it derived that even fetuses in their mother's womb recited the song at the sea? As it is stated: 'In full assemblies, bless God, the Lord, you that are from the source of Israel' (Psalms 68:27), indicating that even children that are in the 'source,' i.e., their mother’s womb, blessed God when they gathered at the sea.