The purpose of this argument is trying to push you for a more appropriate verse which teaches a sinless baby. This is also related to the origin of sin in the doctrine.
Hello,
I hope the Sister will forgive me if I make a contribution:
There is no concept of original sin in Islam; and so it is not possible for a new-born baby to be anything other than sinless.
‘Say: “Should I seek a Lord other than Allāh, when He is the Lord of all things?” Each soul is responsible for its own actions; no soul will bear the burden of another. You will all return to your Lord in the end, and He will tell you the truth about your differences.’
(Al-An‘am:164).
The words: 'Each soul is responsible for its own actions; no soul will bear the burden of another' mean, quite simply, that the guilt of one person (in this context the parent) cannot be passed on, or down, to another (in this context the child). According to the Muslims, this verse finds its counterparts in the Bible:
'Parents may not be put to death for their children, nor children for parents, but each must be put to death for his own crime.’
(Deuteronomy 24:16).
And again:
'Now, you say: "Why doesn't the son bear his father's guilt?" If the son has been law-abiding and upright, has kept all my laws and followed them, most certainly he will live. The one who has sinned is the one who must die; a son is not to bear his father's guilt, nor a father his son's guilt. The upright will be credited with his uprightness, and the wicked with his wickedness.
'If the wicked, however, renounces all the sins he has committed, respects my laws and is law-abiding and upright, he will most certainly live; he will not die. None of the crimes he committed will be remembered against him from then on; he will most certainly live because of his upright actions.
‘Would I take pleasure in the death of the wicked - declares the Lord Yahweh - and not prefer to see him renounce his wickedness and live?’
(Ezekiel: 18: 19-23).
Islam teaches that the lesson from each of the verses I have quoted is clear enough: That Allāh (Subḥānahu ūta'āla), who is Just, will never punish people for the sins of others.
I hope this helps.