If your husband was born in Canada or became a Canadian citizen through naturalization, then your baby will be a Canadian citizen and you will need to obtain a Certificate of Canadian Citizenship so that you may apply for a passport for the baby. You will need to go through the "additional family information" form and update it to show your (Canadian) child on that form.
If your husband was born outside Canada but is a Canadian citizen, then your child is not a Canadian Citizen and you must go through the forms, updating them to include your child and submit the forms that have changed to the visa office - but you cannot do that until you have a birth certificate for your baby.
Assuming your child is a Canadian citizen: if you have not yet received a Certificate of Canadian Citizenship by the time you wish to travel, you will need to obtain a temporary Canadian passport for your baby, or if they will not issue one, you will need a facilitation visa entered into the baby's Ukrainian passport.
If your child is is not a Canadian citizen: you may request a TRV from the embassy; in that application you should ask them to convert it to a TRP application (additional $200 fee) if they determine the baby is inadmissible, which happens - the visa office determines that the baby is unlikely to leave Canada at the end of the TRV. A TRP overcomes that inadmissibility and would normally be granted on humanitarian and compassionate grounds.