purchased infant ticket for child turns 2 while in israel? what do to?

[chanoch770]

I purchased united ticket for the family for the summer, when Widerĝe had the "price mistake" on November with united.
For my baby who turns 2 while we in Israel I purchased infant ticket (by changing the DOB, thinking is only wideroe policy).
My question is what is your suggestion. To buy a new ticket for him,  or try to go like this?

thank you.

[mvpjsand]

They will make you get a ticket