diff --git a/analyse/service/shard_processor.go b/analyse/service/shard_processor.go
index d49074c..2cf51b2 100644
--- a/analyse/service/shard_processor.go
+++ b/analyse/service/shard_processor.go
@@ -47,6 +47,7 @@ func (p *ShardProcessor) aggregateAll(ctx context.Context, consumerArn string, p
 	resultsChan := make(chan *ProcessOutput)
 	pendingEnumerations := len(parentShardIDs)
 	aggregatedShards := make([]*ProcessOutput, 0)
+	aggregatedChildren := make(map[string]bool)
 
 	for _, shardID := range parentShardIDs {
 		go reader(ctx, resultsChan, shardID, consumerArn)
@@ -60,8 +61,11 @@ func (p *ShardProcessor) aggregateAll(ctx context.Context, consumerArn string, p
 			aggregatedShards = append(aggregatedShards, r)
 			if children {
 				for _, cs := range r.childShards {
-					pendingEnumerations++
-					go reader(ctx, resultsChan, *cs.ShardId, consumerArn)
+					if _, ok := aggregatedChildren[*cs.ShardId]; !ok {
+						aggregatedChildren[*cs.ShardId] = true
+						pendingEnumerations++
+						go reader(ctx, resultsChan, *cs.ShardId, consumerArn)
+					}
 				}
 			}
 		} else {
diff --git a/analyse/service/shard_processor_test.go b/analyse/service/shard_processor_test.go
index 8c35329..f99ec91 100644
--- a/analyse/service/shard_processor_test.go
+++ b/analyse/service/shard_processor_test.go
@@ -27,8 +27,9 @@ func Test_aggregateAll(t *testing.T) {
 	cases := []testCase{
 		{Name: "No shards with children and enumeration is required", ShardIDs: []string{"a", "b"}, EnumerateChildren: true, Expect: []string{"a", "b"}},
 		{Name: "No shards with children and enumeration is not required", ShardIDs: []string{"a", "b"}, EnumerateChildren: false, Expect: []string{"a", "b"}},
-		{Name: "Shards with children and enumeration is required", ShardIDs: []string{"a", "b"}, EnumerateChildren: true, ChildShards: map[string][]types.ChildShard{"a": {{ShardId: aws.String("c")}, {ShardId: aws.String("d")}}}, Expect: []string{"a", "b", "c", "d"}},
-		{Name: "Shards with children and enumeration is not required", ShardIDs: []string{"a", "b"}, EnumerateChildren: false, ChildShards: map[string][]types.ChildShard{"a": {{ShardId: aws.String("c")}, {ShardId: aws.String("d")}}}, Expect: []string{"a", "b"}},
+		{Name: "Shards with children and enumeration is required", ShardIDs: []string{"a", "b"}, EnumerateChildren: true, ChildShards: map[string][]types.ChildShard{"a": {{ShardId: aws.String("c"), ParentShards: []string{"a"}}, {ShardId: aws.String("d"), ParentShards: []string{"a"}}}}, Expect: []string{"a", "b", "c", "d"}},
+		{Name: "Shards with children and enumeration is not required", ShardIDs: []string{"a", "b"}, EnumerateChildren: false, ChildShards: map[string][]types.ChildShard{"a": {{ShardId: aws.String("c"), ParentShards: []string{"a"}}, {ShardId: aws.String("d"), ParentShards: []string{"a"}}}}, Expect: []string{"a", "b"}},
+		{Name: "Shards with a merged child and enumeration is required", ShardIDs: []string{"a", "b"}, EnumerateChildren: true, ChildShards: map[string][]types.ChildShard{"a": {{ShardId: aws.String("c"), ParentShards: []string{"a", "b"}}}, "b": {{ShardId: aws.String("c"), ParentShards: []string{"a", "b"}}}}, Expect: []string{"a", "b", "c"}},
 	}
 
 	for i, c := range cases {