diff --git a/client-mu-plugins/goodbids/src/classes/Core.php b/client-mu-plugins/goodbids/src/classes/Core.php
index b6d176120..2528471f8 100644
--- a/client-mu-plugins/goodbids/src/classes/Core.php
+++ b/client-mu-plugins/goodbids/src/classes/Core.php
@@ -78,7 +78,7 @@ public function __construct() {
 	 *
 	 * @return Core
 	 */
-	public static function get_instance() : Core {
+	public static function get_instance(): Core {
 		if ( null === self::$instance ) {
 			self::$instance = new self();
 		}
@@ -93,7 +93,7 @@ public static function get_instance() : Core {
 	 *
 	 * @return string
 	 */
-	public function get_version() : string {
+	public function get_version(): string {
 		$data = get_plugin_data( GOODBIDS_PLUGIN_FILE );
 		return $data['Version'];
 	}
@@ -105,7 +105,7 @@ public function get_version() : string {
 	 *
 	 * @return void
 	 */
-	public function init() : void {
+	public function init(): void {
 		if ( ! $this->load_config() ) {
 			// TODO: Log error.
 			return;
@@ -124,7 +124,7 @@ public function init() : void {
 	 *
 	 * @return bool
 	 */
-	private function load_config() : bool {
+	private function load_config(): bool {
 		$json_path = GOODBIDS_PLUGIN_PATH . 'config.json';
 		if ( ! file_exists( $json_path ) ) {
 			return false;
@@ -159,7 +159,7 @@ public function get_config( string $key ) : mixed {
 	 *
 	 * @return void
 	 */
-	private function load_plugins() : void {
+	private function load_plugins(): void {
 		if ( ! function_exists( 'wpcom_vip_load_plugin' ) ) {
 			return;
 		}
@@ -184,7 +184,7 @@ private function load_plugins() : void {
 	 *
 	 * @return bool
 	 */
-	public function is_plugin_active( string $plugin ) : bool {
+	public function is_plugin_active( string $plugin ): bool {
 		$plugins = $this->get_config( 'active-plugins' );
 		return in_array( $plugin, $plugins, true );
 	}
@@ -196,7 +196,7 @@ public function is_plugin_active( string $plugin ) : bool {
 	 *
 	 * @return void
 	 */
-	private function load_modules() : void {
+	private function load_modules(): void {
 		add_action(
 			'mu_plugin_loaded',
 			function () {
diff --git a/client-mu-plugins/goodbids/src/classes/network/Sites.php b/client-mu-plugins/goodbids/src/classes/network/Sites.php
index c781bda4d..4532d00b4 100644
--- a/client-mu-plugins/goodbids/src/classes/network/Sites.php
+++ b/client-mu-plugins/goodbids/src/classes/network/Sites.php
@@ -41,6 +41,7 @@ public function __construct() {
 		$this->save_edit_site_fields();
 		$this->new_site_form_fields();
 		$this->edit_site_form_fields();
+		$this->activate_child_theme();
 	}
 
 	/**
@@ -50,7 +51,7 @@ public function __construct() {
 	 *
 	 * @return void
 	 */
-	private function init_np_fields() : void {
+	private function init_np_fields(): void {
 		$this->np_fields = apply_filters(
 			'goodbids_nonprofit_custom_fields',
 			[
@@ -78,7 +79,7 @@ private function init_np_fields() : void {
 					'required'    => true,
 					'context'     => 'both',
 				],
-				'status'    => [
+				'status'     => [
 					'label'       => __( 'Site Status', 'goodbids' ),
 					'type'        => 'select',
 					'default'     => 'pending',
@@ -114,7 +115,7 @@ private function init_np_fields() : void {
 	 *
 	 * @return array
 	 */
-	public function get_np_fields( string $context = 'both' ) : array {
+	public function get_np_fields( string $context = 'both' ): array {
 		if ( empty( $this->np_fields ) ) {
 			$this->init_np_fields();
 		}
@@ -148,7 +149,7 @@ public function get_np_fields( string $context = 'both' ) : array {
 	 *
 	 * @return mixed
 	 */
-	public function get_np_data( int $site_id, string $field_id = '' ) : mixed {
+	public function get_np_data( int $site_id, string $field_id = '' ): mixed {
 		$data = [];
 
 		foreach ( $this->get_np_fields() as $key => $field ) {
@@ -176,7 +177,7 @@ public function get_np_data( int $site_id, string $field_id = '' ) : mixed {
 	 *
 	 * @return void
 	 */
-	private function validate_new_site_fields() : void {
+	private function validate_new_site_fields(): void {
 		add_action(
 			'admin_init',
 			function () {
@@ -236,7 +237,7 @@ function () {
 	 *
 	 * @return void
 	 */
-	private function new_site_form_fields() : void {
+	private function new_site_form_fields(): void {
 		add_action(
 			'network_site_new_form',
 			function () {
@@ -254,7 +255,7 @@ function () {
 	 *
 	 * @return void
 	 */
-	private function edit_site_form_fields() : void {
+	private function edit_site_form_fields(): void {
 		add_action(
 			'network_site_info_form',
 			function ( $site_id ) {
@@ -273,10 +274,9 @@ function ( $site_id ) {
 	 *
 	 * @return void
 	 */
-	private function save_new_site_fields() : void {
+	private function save_new_site_fields(): void {
 		add_action(
 			'wp_initialize_site',
-
 			/**
 			 * @param WP_Site $new_site New site object.
 			 * @param array $args Arguments for the initialization.
@@ -311,10 +311,9 @@ function ( WP_Site $new_site, array $args ) {
 	 *
 	 * @return void
 	 */
-	private function save_edit_site_fields() : void {
+	private function save_edit_site_fields(): void {
 		add_action(
 			'wp_update_site',
-
 			/**
 			 * @param WP_Site $new_site New site object.
 			 * @param WP_Site $old_site Old site object.
@@ -347,4 +346,33 @@ function ( WP_Site $new_site, WP_Site $old_site ) {
 			2
 		);
 	}
+
+	/**
+	 * Activate nonprofit child theme.
+	 *
+	 * @since 1.0.0
+	 *
+	 * @param int $site_id Site ID.
+	 *
+	 * @return void
+	 */
+	private function activate_child_theme(): void {
+		add_action(
+			'wpmu_new_blog',
+			function ( $site_id ) {
+				$stylesheet = 'goodbids-nonprofit';
+
+				// Switch to the new site
+				switch_to_blog( $site_id );
+
+				// Check if we the Goodbids child theme exists
+				if ( ! wp_get_theme( $stylesheet )->exists() ) {
+					return;
+				}
+				switch_theme( $stylesheet );
+
+				restore_current_blog();
+			}
+		);
+	}
 }