diff --git a/markdownify/__init__.py b/markdownify/__init__.py
index 1e7b787..b67c32b 100644
--- a/markdownify/__init__.py
+++ b/markdownify/__init__.py
@@ -377,7 +377,11 @@ def convert_th(self, el, text, convert_as_inline):
 
     def convert_tr(self, el, text, convert_as_inline):
         cells = el.find_all(['td', 'th'])
-        is_headrow = all([cell.name == 'th' for cell in cells])
+        is_headrow = (
+            all([cell.name == 'th' for cell in cells])
+            or (not el.previous_sibling and not el.parent.name == 'tbody')
+            or (not el.previous_sibling and el.parent.name == 'tbody' and len(el.parent.parent.find_all(['thead'])) < 1)
+        )
         overline = ''
         underline = ''
         if is_headrow and not el.previous_sibling:
diff --git a/tests/test_tables.py b/tests/test_tables.py
index 334bfb7..ebbb146 100644
--- a/tests/test_tables.py
+++ b/tests/test_tables.py
@@ -119,6 +119,28 @@
     </tbody>
 </table>"""
 
+table_head_body_missing_head = """<table>
+    <thead>
+        <tr>
+            <td>Firstname</td>
+            <td>Lastname</td>
+            <td>Age</td>
+        </tr>
+    </thead>
+    <tbody>
+        <tr>
+            <td>Jill</td>
+            <td>Smith</td>
+            <td>50</td>
+        </tr>
+        <tr>
+            <td>Eve</td>
+            <td>Jackson</td>
+            <td>94</td>
+        </tr>
+    </tbody>
+</table>"""
+
 table_missing_text = """<table>
     <thead>
         <tr>
@@ -187,6 +209,7 @@ def test_table():
     assert md(table_with_linebreaks) == '\n\n| Firstname | Lastname | Age |\n| --- | --- | --- |\n| Jill | Smith  Jackson | 50 |\n| Eve | Jackson  Smith | 94 |\n\n'
     assert md(table_with_header_column) == '\n\n| Firstname | Lastname | Age |\n| --- | --- | --- |\n| Jill | Smith | 50 |\n| Eve | Jackson | 94 |\n\n'
     assert md(table_head_body) == '\n\n| Firstname | Lastname | Age |\n| --- | --- | --- |\n| Jill | Smith | 50 |\n| Eve | Jackson | 94 |\n\n'
+    assert md(table_head_body_missing_head) == '\n\n| Firstname | Lastname | Age |\n| --- | --- | --- |\n| Jill | Smith | 50 |\n| Eve | Jackson | 94 |\n\n'
     assert md(table_missing_text) == '\n\n|  | Lastname | Age |\n| --- | --- | --- |\n| Jill |  | 50 |\n| Eve | Jackson | 94 |\n\n'
-    assert md(table_missing_head) == '\n\n|  |  |  |\n| --- | --- | --- |\n| Firstname | Lastname | Age |\n| Jill | Smith | 50 |\n| Eve | Jackson | 94 |\n\n'
-    assert md(table_body) == '\n\n|  |  |  |\n| --- | --- | --- |\n| Firstname | Lastname | Age |\n| Jill | Smith | 50 |\n| Eve | Jackson | 94 |\n\n'
+    assert md(table_missing_head) == '\n\n| Firstname | Lastname | Age |\n| --- | --- | --- |\n| Jill | Smith | 50 |\n| Eve | Jackson | 94 |\n\n'
+    assert md(table_body) == '\n\n| Firstname | Lastname | Age |\n| --- | --- | --- |\n| Jill | Smith | 50 |\n| Eve | Jackson | 94 |\n\n'