The relationship between the 11-month-old baby and those arrested has not been confirmed.
It is believed the girl was not at her home address at the time of the incident.
Nobody else was injured during the attack.
More top news
Clarke Carlisle "thinks about and prays for" the lorry driver he jumped in front of last year when he attempted to take his own life
The number of veterans seeking help for post traumatic stress disorder (PTSD) has risen by more than a quarter over the last year.
Plaid Cymru will today launch its election manifesto in Bangor ahead of the general election.