update the Field values from parent to child Trigger

Where Account name, phone is update  related contact Lastname and phone also update.

trigger ContactUpdate on Account (after update)

 {

   set<Id> acctIds = new set<Id>();

    map<Id, Account> mapAccount = new map<Id, Account>();

    list<Contact> listContact = new list<Contact>();

    for(Account acct : trigger.new) 

    {

        acctIds.add(acct.Id);

        mapAccount.put(acct.Id, acct);

    }

    listContact = [SELECT LastName ,Phone , AccountId FROM Contact WHERE AccountId IN : acctIds];

    

   if(listContact.size() > 0) 

   {

        for(Contact con : listContact)

        {

            con.LastName= mapAccount.get(con.AccountId).Name;

            con.phone= mapAccount.get(con.AccountId).phone;

        }

        update listContact;

    }

}