What if they die in infancy
God the Father knows whom would have sought Him from those that would not since He is the One that reveals the Son to even babes & since He knew us before we were even conceived in the womb, then I believe any that die in the womb, He would have saved them since He knew them that wanted to be saved & live with God forever.
Matthew 11:25 At that time Jesus answered and said, I thank thee, O Father, Lord of heaven and earth, because thou hast hid these things from the wise and prudent, and hast revealed them unto babes. 26 Even so, Father: for so it seemed good in thy sight. 27 All things are delivered unto me of my Father: and no man knoweth the Son, but the Father; neither knoweth any man the Father, save the Son, and he to whomsoever the Son will reveal him. KJV
Psalm 51:5 Behold, I was shapen in iniquity; and in sin did my mother conceive me. 6 Behold, thou desirest truth in the inward parts: and in the hidden part thou shalt make me to know wisdom. 7 Purge me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow. KJV
Psalm 139:13 For thou hast possessed my reins: thou hast covered me in my mother's womb. 14 I will praise thee; for I am fearfully and wonderfully made: marvellous are thy works; and that my soul knoweth right well. 15 My substance was not hid from thee, when I was made in secret, and curiously wrought in the lowest parts of the earth. 16 Thine eyes did see my substance, yet being unperfect; and in thy book all my members were written, which in continuance were fashioned,
when as yet there was none of them. 17 How precious also are thy thoughts unto me, O God! how great is the sum of them! KJV