diff --git a/config/flay.yml b/config/flay.yml
index 57f9d0d1..06b115ff 100644
--- a/config/flay.yml
+++ b/config/flay.yml
@@ -1,3 +1,3 @@
 ---
 threshold: 18
-total_score: 1160
+total_score: 1162
diff --git a/config/flog.yml b/config/flog.yml
index 2f43979a..2c02e555 100644
--- a/config/flog.yml
+++ b/config/flog.yml
@@ -1,2 +1,2 @@
 ---
-threshold: 29.3
+threshold: 27.7
diff --git a/lib/mutant/ast/meta/const.rb b/lib/mutant/ast/meta/const.rb
index f19ff974..2f3b01d6 100644
--- a/lib/mutant/ast/meta/const.rb
+++ b/lib/mutant/ast/meta/const.rb
@@ -9,6 +9,8 @@ module Mutant
 
         children :base, :name
 
+        public :base, :name
+
         # Test if AST node is possibly a top level constant
         #
         # @return [Boolean]
diff --git a/lib/mutant/ast/meta/optarg.rb b/lib/mutant/ast/meta/optarg.rb
index 0b1a8558..a2fcfe9f 100644
--- a/lib/mutant/ast/meta/optarg.rb
+++ b/lib/mutant/ast/meta/optarg.rb
@@ -11,6 +11,8 @@ module Mutant
 
         children :name, :default_value
 
+        public :name, :default_value
+
         # Test if optarg definition intends to be used
         #
         # @return [Boolean]
diff --git a/lib/mutant/ast/meta/resbody.rb b/lib/mutant/ast/meta/resbody.rb
index dbefec10..fe34790d 100644
--- a/lib/mutant/ast/meta/resbody.rb
+++ b/lib/mutant/ast/meta/resbody.rb
@@ -8,6 +8,8 @@ module Mutant
         include NamedChildren, Concord.new(:node)
 
         children :captures, :assignment, :body
+
+        public :captures, :assignment, :body
       end # Resbody
 
     end # Meta
diff --git a/lib/mutant/ast/meta/restarg.rb b/lib/mutant/ast/meta/restarg.rb
index 3e1165c4..43705868 100644
--- a/lib/mutant/ast/meta/restarg.rb
+++ b/lib/mutant/ast/meta/restarg.rb
@@ -8,6 +8,8 @@ module Mutant
         include NamedChildren, Concord.new(:node)
 
         children :name
+
+        public :name
       end # Restarg
 
     end # Meta
diff --git a/lib/mutant/ast/meta/send.rb b/lib/mutant/ast/meta/send.rb
index 6f1e9d4e..9689f58e 100644
--- a/lib/mutant/ast/meta/send.rb
+++ b/lib/mutant/ast/meta/send.rb
@@ -9,6 +9,8 @@ module Mutant
 
         children :receiver, :selector
 
+        public :receiver, :selector
+
         INDEX_ASSIGNMENT_SELECTOR            = :[]=
         ATTRIBUTE_ASSIGNMENT_SELECTOR_SUFFIX = '='.freeze
 
@@ -16,6 +18,7 @@ module Mutant
         #
         # @return [Enumerable<Parser::AST::Node>]
         alias_method :arguments, :remaining_children
+        public :arguments
 
         # Test if AST node is a valid assignment target
         #
diff --git a/lib/mutant/ast/meta/symbol.rb b/lib/mutant/ast/meta/symbol.rb
index daa87b8a..941738ed 100644
--- a/lib/mutant/ast/meta/symbol.rb
+++ b/lib/mutant/ast/meta/symbol.rb
@@ -9,6 +9,8 @@ module Mutant
 
         children :name
 
+        public :name
+
       end # Symbol
     end # Meta
   end # AST
diff --git a/lib/mutant/ast/named_children.rb b/lib/mutant/ast/named_children.rb
index 8fedf767..1657da7e 100644
--- a/lib/mutant/ast/named_children.rb
+++ b/lib/mutant/ast/named_children.rb
@@ -42,7 +42,7 @@ module Mutant
         #
         # @return [undefined]
         def define_named_child(name, index)
-          define_method(name) do
+          define_private_method(name) do
             children.at(index)
           end
         end
@@ -53,15 +53,15 @@ module Mutant
         #
         # @return [undefined]
         def define_remaining_children(names)
-          define_method(:remaining_children_with_index) do
+          define_private_method(:remaining_children_with_index) do
             children.each_with_index.drop(names.length)
           end
 
-          define_method(:remaining_children_indices) do
+          define_private_method(:remaining_children_indices) do
             children.each_index.drop(names.length)
           end
 
-          define_method(:remaining_children) do
+          define_private_method(:remaining_children) do
             children.drop(names.length)
           end
         end
@@ -76,6 +76,14 @@ module Mutant
           define_remaining_children(names)
         end
 
+        # Define private method
+        #
+        # @param [Symbol] name
+        def define_private_method(name, &block)
+          define_method(name, &block)
+          private(name)
+        end
+
       end # ClassMethods
     end # NamedChildren
   end # AST
diff --git a/spec/unit/mutant/ast/named_children_spec.rb b/spec/unit/mutant/ast/named_children_spec.rb
index e670d959..512a40e6 100644
--- a/spec/unit/mutant/ast/named_children_spec.rb
+++ b/spec/unit/mutant/ast/named_children_spec.rb
@@ -8,6 +8,14 @@ RSpec.describe Mutant::AST::NamedChildren do
       end
     end
 
+    def publish
+      klass.class_eval do
+        public :foo, :bar
+
+        public :remaining_children, :remaining_children_indices, :remaining_children_with_index
+      end
+    end
+
     let(:instance) { klass.new(node) }
 
     let(:node_foo) { s(:foo) }
@@ -17,26 +25,42 @@ RSpec.describe Mutant::AST::NamedChildren do
     let(:node) { s(:node, node_foo, node_bar, node_baz) }
 
     describe 'generated methods' do
+      specify 'are private by default' do
+        %i[
+          foo
+          bar
+          remaining_children
+          remaining_children_indices
+          remaining_children_with_index
+        ].each do |name|
+          expect(klass.private_instance_methods.include?(name)).to be(true)
+        end
+      end
+
       describe '#remaining_children' do
         it 'returns remaining unnamed children' do
+          publish
           expect(instance.remaining_children).to eql([node_baz])
         end
       end
 
       describe '#remaining_children_indices' do
         it 'returns remaining unnamed children indices' do
+          publish
           expect(instance.remaining_children_indices).to eql([2])
         end
       end
 
       describe '#remaining_children_with_index' do
         it 'returns remaining unnamed children indices' do
+          publish
           expect(instance.remaining_children_with_index).to eql([[node_baz, 2]])
         end
       end
 
       describe '#foo' do
         it 'returns named child foo' do
+          publish
           expect(instance.foo).to be(node_foo)
         end
       end
@@ -44,6 +68,7 @@ RSpec.describe Mutant::AST::NamedChildren do
       describe '#bar' do
         context 'when node is present' do
           it 'returns named child bar' do
+            publish
             expect(instance.bar).to be(node_bar)
           end
         end
@@ -52,6 +77,7 @@ RSpec.describe Mutant::AST::NamedChildren do
           let(:node) { s(:node, node_foo) }
 
           it 'returns nil' do
+            publish
             expect(instance.bar).to be(nil)
           end
         end