diff --git a/src/art.rs b/src/art.rs
index f0c4eeb..691c268 100644
--- a/src/art.rs
+++ b/src/art.rs
@@ -582,7 +582,7 @@ impl<P: KeyTrait, V: Clone> Node<P, V> {
             NodeType::Node16(n) => n.num_children(),
             NodeType::Node48(n) => n.num_children(),
             NodeType::Node256(n) => n.num_children(),
-            NodeType::Twig(n) => n.num_children(),
+            NodeType::Twig(_) => 0,
         }
     }
 
diff --git a/src/node.rs b/src/node.rs
index c799b42..86fcad1 100644
--- a/src/node.rs
+++ b/src/node.rs
@@ -61,12 +61,7 @@ impl<K: KeyTrait, V: Clone> TwigNode<K, V> {
         }
     }
 
-    #[inline(always)]
-    pub fn num_children(&self) -> usize {
-        self.values.len()
-    }
-
-    pub fn version(&self) -> u64 {
+    pub(crate) fn version(&self) -> u64 {
         self.values
             .iter()
             .map(|value| value.version)
@@ -284,12 +279,12 @@ impl<P: KeyTrait, N: Version, const WIDTH: usize> FlatNode<P, N, WIDTH> {
         new_node
     }
 
-    pub fn get_value_if_single_child(&self) -> (&P, Option<Arc<N>>) {
+    pub(crate) fn get_value_if_single_child(&self) -> (&P, Option<Arc<N>>) {
         assert_eq!(self.num_children, 1);
         (&self.prefix, self.children[0].clone())
     }
 
-    pub fn grow(&self) -> Node48<P, N> {
+    pub(crate) fn grow(&self) -> Node48<P, N> {
         let mut n48 = Node48::new(self.prefix.clone());
         for i in 0..self.num_children as usize {
             if let Some(child) = self.children[i].as_ref() {